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 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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