[" 33.Prove that: "4sin A sin(60^(@)-A)s...

[" 33.Prove that: "4sin A sin(60^(@)-A)sin(60^(@)+A)=sin3A" ."],[" Hence deduce that: "sin20^(@)times sin40^(@)times sin60^(@)times sin80^(@)=(3)/(16)]

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