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Express the product as a sum containing only sines or only cosines.

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Express the product as a sum containing only sines or only cosines.

sin (4θ) sin (2θ)

sum-or-difference
trigonometric-functions

asked Jan 27, 2015 in PRECALCULUS by anonymous

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1 Answer

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Step 1:

The trigonometric function is .

Use the product-to-sum formula of trigonometric function: .

Use an even-odd identity of trigonometric function: .

.

Solution :

.

answered Jan 27, 2015 by james Pupil

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