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Find the exact value of the expression.

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Find the exact value of the expression.

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

trigonometric-functions
exact-value

asked Jan 27, 2015 in PRECALCULUS by anonymous

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1 Answer

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Step 1:

The trigonometric expression is .

Difference formula for cosine function : .

Solution :

.

answered Jan 27, 2015 by joseph Apprentice

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