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use the power-reducing formulas

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 use the power-reducing formulas to rewrite the expression in terms of the first power of the cosine.

cos^4 x

 

asked Jan 22, 2015 in TRIGONOMETRY by anonymous

1 Answer

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Step 1:

The cosine power function is image.

image

Recall the power reducing formula image.

image

image

image

Multiply and divide by 2.

image.

Solution:

The expression is reduced as image.

answered Jan 22, 2015 by cameron Mentor
edited Jan 22, 2015 by cameron

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