kasiasamp1663 kasiasamp1663

07-09-2017
Mathematics

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Simplify the expression by using a double-angle formula 1-2sin^2(3theta)

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WojtekR WojtekR

07-09-2017

We know that:

[tex]\cos(2x)=1-2\sin^2(x)[/tex]

Here [tex]x=3\theta[/tex] so:

[tex]1-2\sin^2(3\theta)=\cos(2\cdot3\theta)=\cos(6\theta)[/tex]

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