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

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asked Mar 4, 2016 193k views

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

Mathematics
high-school

Yehor Nemov asked

by Yehor Nemov

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$1-2sin^2(2\pi)/(9)=cos2(2\pi)/(9)=cos(4\pi)/(9)=cos80=sin10$
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remember:

1-2sin^2x=cos2x

Razican answered Mar 8, 2016

by Razican

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

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