Vanstone145 Vanstone145

08-08-2015
Mathematics

Answered

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

Verified Answer :

turk3005 turk3005

08-08-2015

\(1-2sin^2\frac{2\pi}{9}=cos2\frac{2\pi}{9}=cos\frac{4\pi}{9}=cos80=sin10\)
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remember:

\(1-2sin^2x=cos2x\)

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