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need someone on this one

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Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.

sin 
4π
7
 cos 
5π
21
  cos 
4π
7
 sin 
5π
21
 
Find its exact value.

 

asked Apr 1, 2016 in PRECALCULUS by anonymous

1 Answer

0 votes

Step 1:

The trigonometric function is .

 

Fundamental trigonometric identities: .

Rewrite the trigonometric function is  .

Simplify the function.

Fundamental trigonometric identities: .

Solution:

The value of trigonometric function is .

answered Apr 1, 2016 by lilly Expert
edited Apr 1, 2016 by lilly

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