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Prove that: sin(pi/14)sin((3pi)/14)sin(...

Prove that: `sin(pi/14)sin((3pi)/14)sin((5pi)/14)sin((7pi)/14)sin((9pi)/14)sin((11pi)/14)sin((13pi)/14)=1/(64)`

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Prove that: sin((pi)/(14))sin((3 pi)/(14))sin((5 pi)/(14))sin((7 pi)/(14))sin((9 pi)/(14))sin((11 pi)/(14))sin((13 pi)/(14))=(1)/(64)

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