- #1

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I tried fixing the right side, changing cos2x to 1 - 2sin^2x, and I went all the way to

(4sin^2x-4sin^4x-2-8sin^4x+8sin^6x+4sin^2x)/6.

I am clueless on how to continue the proof. Please help. Thanks.

- Thread starter mathhelp123
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- #1

- 1

- 0

I tried fixing the right side, changing cos2x to 1 - 2sin^2x, and I went all the way to

(4sin^2x-4sin^4x-2-8sin^4x+8sin^6x+4sin^2x)/6.

I am clueless on how to continue the proof. Please help. Thanks.

- #2

Tide

Science Advisor

Homework Helper

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[tex]e^{4 i \theta} = \left( e^{i \theta} \right)^4[/tex]

and apply Euler's formula to the individual exponentials.

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