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cant see how to figure this one out

0 votes

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

cos 11° cos 49° sin 11° sin 49°
        Find its exact value.

 

asked Apr 1, 2016 in PRECALCULUS by anonymous

1 Answer

0 votes

The trigonometric expression is image.

Subtraction formula for trigonometric identity is image.

Substitute image and imagein the trigonometric formula.

image

The value of trigonometric expression is image.

answered Apr 1, 2016 by Anney Mentor

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