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

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

cos 400o . sec 40o

asked Jan 26, 2015 in PRECALCULUS by anonymous

1 Answer

0 votes

Step 1:

The trigonometric function is image.

image

Use sum formula of cosine function : image.

image

image.

Substitute image in above trigonometric function.

image

Use reciprocal identity : image.

image

image.

Solution :

image.

answered Jan 26, 2015 by joseph Apprentice

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