Welcome :: Homework Help and Answers :: Mathskey.com

Q&A
Unanswered
Categories
Users
Ask a Question

Welcome to Mathskey.com Question & Answers Community. Ask any math/science homework question and receive answers from other members of the community.

Q&A Categories
BASIC MATH (93)
PRE-ALGEBRA (441)
ALGEBRA 1 (2,220)
GEOMETRY (864)
ALGEBRA 2 (2,751)
TRIGONOMETRY (1,187)
PRECALCULUS (1,903)
CALCULUS (2,802)
STATISTICS (129)
PHYSICS (659)
CHEMISTRY (137)
MECHANICAL ENGINEERING (64)
ELECTRICAL ENGINEERING (207)
Winplot Tutorials (2)

Most popular tags

solving-equations system-of-equations functions math slope-intercept-form physics homework-help trigonometric-identities integration limits substitution-method calculus

13,459 questions

17,854 answers

1,446 comments

807,727 users

Find the exact value of the expression.

0 votes

Find the exact value of the expression.

cos 70^o cos 20^o - sin 70^o sin 20^o

trigonometric-functions
exact-value

asked Jan 27, 2015 in PRECALCULUS by anonymous

Share this question

Google+ Facebook Twitter LinkedIn Reddit

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

0 votes

Step 1:

The trigonometric expression is .

Difference formula for cosine function : .

Solution :

.

answered Jan 27, 2015 by joseph Apprentice

Please log in or register to add a comment.

Related questions

Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.

asked Feb 8, 2019 in PRECALCULUS by anonymous

trigonometric-functions
exact-value
properties-of-trigonometric-functions

Find the exact value of each expression. Do not use a calculator.

asked Jan 27, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

Find the exact value of the expression.

asked Jan 27, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

Find the exact value of the expression.

asked Jan 27, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

Use the fact that the trigonometric functions are periodic to find the exact value of each expression.

asked Jan 24, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value
periodic

find the exact value of the expression. Do not use a calculator.

asked Jan 24, 2015 in TRIGONOMETRY by anonymous

trigonometric-functions
exact-value

apply a sum or defference identity to find the exact function value of cos(13pi/12)

asked Apr 1, 2016 in PRECALCULUS by anonymous

exact-value
trigonometric-functions
trignometric-functions
product-sum-formulas
trigonometric-multiple-angle-functions-

find the exact value of sin u/2 given cos u = 12/13, where 0<u<pi/2

asked Apr 1, 2016 in PRECALCULUS by anonymous

trignometric-functions
half-angle-trigonometric-formulas
trigonometric-functions
exact-value
double-angle-trigonometric-functions

Find the exact value of the six trigonometric functions of the angle θ in the figure.

asked Jan 27, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

Find the exact value of the following under the given conditions:

asked Jan 27, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

Find the exact value of: sin 1° + sin 2° + sin 3° + ..... + sin 358° + sin 359°

asked Jan 26, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

find the exact value of each of the remaining trigonometric functions of θ .

asked Jan 24, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

sin θ and cos θ are given. Find the exact value of the four remaining trigonometric functions.

asked Jan 24, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

f (θ) = sin θ and g (θ) = cos θ. Find the exact value of each function below if θ = 60 degrees.

asked Jan 24, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

Find the exact value of:

asked Jan 24, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value

Find the exact value of each of the six trigonometric functions of θ.

asked Jan 24, 2015 in PRECALCULUS by anonymous

trigonometric-functions
exact-value
terminal-angle

Find the exact value under the given conditions.

asked Oct 31, 2018 in PRECALCULUS by anonymous

exact-value
trigonometric-functions

find the exact value of cos2a

asked May 16, 2016 in TRIGONOMETRY by anonymous

double-angle-trigonometric-functions
trigonometric-functions
exact-value
trignometric-functions
trigonometric-multiple-angle-functions-

Find the value of the expression.

asked Feb 11, 2015 in TRIGONOMETRY by anonymous

trigonometric-functions
inverse-trigonometric-functions
exact-value

find the exact value. Do not use a calculator.

asked Jan 24, 2015 in TRIGONOMETRY by anonymous

trigonometric-functions
exact-value

Copyright © 2024 MATHSKEY. All Rights Reserved. Sitemap|Terms Of Use|Disclaimer|Contact Us|FAQ

...