# How to show that? A(x)=4cosx.cos2x.sin4x

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For each x of R we put:

A(x): Sinx+Sin3x+Sin5x+Sin7x

For each x of R we put:

A(x): Sinx+Sin3x+Sin5x+Sin7x

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Shwetank Mauria
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Feb 10, 2018

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Please see below.

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We use here the identity relations -

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