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Question #6e4bb

1 Answer

Jan 13, 2018

#4cos(20)#

Explanation:

Given #4-8sin^2(10)#

factor 4 out of both terms:

#4(1-2sin^2(10))#

Use the identity that #cos(2x)=1-2sin^2(x)#:

#4cos(2(10)) = 4cos(20)#

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