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sin20^(@)sin40^(@)sin60^(@)sin80^(@)=...

sin20^(@)sin40^(@)sin60^(@)sin80^(@)=

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

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

sin20^(0)sin40^(0)sin60^(0)sin80^(@)=(3)/(16)

sin20^(@)+sin40^(@)-sin80^(@)=

sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)-sin70^(@)-sin80^(@)=

Prove that sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@) .

sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@)

sin 20^(@) sin 40^(@) sin 60^(@) sin 80^(@) =(3)/(16)