Vanstone145 Vanstone145

09-08-2015
Mathematics

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Simplify the expression by using a double angle formula 1-2sin^2 2pi/9

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turk3005 turk3005

09-08-2015

[tex]1-2sin^2\frac{2\pi}{9}=cos2\frac{2\pi}{9}=cos\frac{4\pi}{9}=cos80=sin10[/tex]
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remember:

[tex]1-2sin^2x=cos2x[/tex]

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