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Prove that: sin10^0sin30^0sin50^0sin70^0...

Prove that: `sin10^0sin30^0sin50^0sin70^0=1/(16)dot`

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Prove that: sin20^0sin40^0sin60^0sin80^0=3/(16)

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Prove that: \ sin 10^0sin 50^0sin 60^0sin 70^0=(sqrt(3))/(16)

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