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Prove that: i) sin20^(@)sin40^(@)sin60...

Prove that:
i) `sin20^(@)sin40^(@)sin60^(@)sin80^(@)=3/16`
ii) `sin10^(@)sin50^(@)sin60^(@)sin70^(@)=sqrt(3)/16`
iii) `sin20^(@)sin40^(@)sin80^(@)=sqrt(3)/8`

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