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

1 Answer

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Step 1:
The trigonometric function is image.
Rewrite the trigonometric function is
image
Simplify the function.
image
Fundamental trigonometric identities: image.
image
Rewrite the trigonometric function is
image

Addition formula for trigonometric identity is image.

Substitute image and imagein the trigonometric formula.

image

Solution :

The value of trigonometric function is image

answered Apr 1, 2016 by Anney Mentor
edited Apr 1, 2016 by Anney

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