Pre-Calculus

Have pre-calculus questions? Ask a pre-calculus tutor

Connect one-on-one with {0} who will answer your question

Can I use the half...

Can I use the half angle formula to solve the simplify the trig expressions below1. Cos 3x.cos2x-sin3x.sin2x

2. 2 cos ^2a -1

2. 2 cos ^2a -1

Show More

Show Less

Was this answer helpful?

Describe your issueThe assistant will guide you

Chat 1:1 with a tutorLicensed Experts are available 24/7

100% satisfaction guaranteeGet all the answers you need

Related Pre-Calculus Questions

Another problem, To find the distance across a river a

Another problem Scott, To find the distance across a river a surveyor choose points A and B which are 203 m apart on one side of the river. She then chooses a reference point on the opposite side of t… read more

Would you please help me with this problem? To find the

Hi Scott, would you please help me with this problem? To find the distance across a river, a surveyor choose points A and B, which are 220 yd apart in one side of the river. She then chooses a referen… read more

Simplify Trigonometric Expressions? Can you show me how you

Simplify Trigonometric Expressions? Can you show me how you got them, please?(sin^(2)x-tan^(2)x)/(tan^(2)xsin^(2)x)… read more

I have a geometry question. I have two parallel lines cut by

I have a geometry question.I have two parallel lines cut by a transversal.Given: measure angle 2 = 8b + a measure angle 4 = 3a + 5b measure angle 5 = 7a + 25bangle 2 and 4 are vertical angles so they … read more

I saw you did this about a year ago. Can you help me

I saw you did this about a year ago. Can you help me out...rather quickly? Show All calculation!! 1. Solve the following Expression 5 (B - 4) =10 2. Solve the following equation for the variable L. p … read more

I need someone to help me with this. I need to compare my

HI, I need someone to help me with this. I need to compare my answers before I turn this in. Thank you. Exam: 250311RR - Trigonometric Functions 1. Find a positive angle less than 360° that's cotermin… read more

Record your answers and work on the separate answer sheet provided. There

Record your answers and work on the separate answer sheet provided. There are 28 problems. Problems #1–6 are Multiple Choice. Problems #7–17 are Short Answer. (Work not required to be shown) Problems … read more

I have a math question. I need to simplifyand solve the math

I have a math question. I need to simplifyand solve the math equation below: ((H-(cosX*W))/(tanX))=(L-(sinX*W)) H, L and W are known but not X so the solution should be X= (something). I am stuck. Tha… read more

1. The cosine function for a specific angle in a triangle is

1. The cosine function for a specific angle in a triangle is defined by the ratio of the triangle's A. adjacent side and opposite angle. B. opposite side and adjacent side. C. adjacent side and hypote… read more

1. Simplify the following expression: sin 4x cos 3x + sin 3x

1. Simplify the following expression: sin 4x cos 3x + sin 3x cos 4x 2. Use half-angle formulas to solve the given problem. Find tanx if sin (x/2)=24/26 *x represents the angle sign-looks like a 0 with… read more

RRJha, you interested in helping me with this one?1.

RRJha, you interested in helping me with this one? 1. To use the law of sines, which of the following statements must be true? A. The triangle must be a right triangle. B. All three side lengths must … read more

"for ryan" 1.find tan 2x if sin x = 0.5(in sec quad0 tan2x=? 2.simplify

"for ryan" 1.find tan 2x if sin x = 0.5(in sec quad0 tan2x=? 2.simplify the given expression by giving the results in terms of one half of the given angle.then use the calculator to verify the result.… read more

Find the exact value of cos pi/12 using half angle identity?

Find the exact value of cos pi/12 using half angle identity. simplify,including any radicals. Use integers or fractions for any numbers in the expression.Rationalize all denominators.… read more

in finding the path of a sliding particle, the expression sqrt4.5-4.5cos

in finding the path of a sliding particle, the expression sqrt4.5-4.5cos theta is used. Simplify this expression using half angle identity.… read more

use an identity to write the expression as single trig function. sqrt1-cos26degrees/2

use an identity to write the expression as single trig function. sqrt1-cos26degrees/2 a. sin 26 deg b. sin 13 deg c. cos 26 deg d. cos 13 deg… read more

find value using the double angle formula. find cos 56 deg.

find value using the double angle formula. find cos 56 deg. directly and by using functions of 28 deg.… read more

solve the given trig. equation analytically (using identities

solve the given trig. equation analytically (using identities when necessary for exact values when possible) for values of x for 0 <_ x < 2 pi. 2 cos x +1 = 0… read more

I have a couple word problems that I am not sure on here: 1)

I have a couple word problems that I am not sure on here: 1) Draw a diagram to solve this problem: Oshawa is 10 km due east of Ajax. Uxbridge is 18 km NW of Oshawa. How far is it from Ajax to Uxbridge… read more

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.

JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.

Web sites like justanswer.com/legal

...leave nothing to chance.

...leave nothing to chance.

Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.

Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

Los Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

Hesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

Kernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

Woodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

Elkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

Dallas, TX

< Previous | Next >

rajeevanpillai

Master's Degree

487 satisfied customers

B.Sc in Mathematics and M.Sc, M Phil in Statistics

Mr. Gregory White

Master's Degree

167 satisfied customers

M.A., M.S. Education / Educational Administration

mhasan420

Master's Degree

37 satisfied customers

BA Maths, Oxford

JACUSTOMER-yrynbdjl-

Master's Degree

13 satisfied customers

I have taught college Mathematics for the past 10 years.

Dr. Arthur Rubin

Doctoral Degree

12 satisfied customers

Ph.D. in Mathematics, 1978, from the California Institute of Technology, over 20 published papers

Sandhya_sharma

Master's Degree

15,162 satisfied customers

I hold M.Sc and M.Phil degrees in math and have several years of teaching experience.

Kofi

PhD in Statistics

884 satisfied customers

Masters in Mathematics and Statistics

< Previous | Next >

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.