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

Recent Visits

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

13,435 questions

17,804 answers

1,438 comments

774,880 users

Find the exact value of the expression.

0 votes

Find the exact value of the expression.

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

asked Jan 27, 2015 in PRECALCULUS by anonymous

1 Answer

0 votes

Step 1:

The trigonometric expression is image.

Difference formula for cosine function : image.

image

Solution :

image.

answered Jan 27, 2015 by joseph Apprentice

Related questions

...