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[sin12^(@)sin24^(@)sin48^(@)sin84^(@)=],...

[sin12^(@)sin24^(@)sin48^(@)sin84^(@)=],[" (a) "cos20^(@)cos40^(@)cos60^(@)cos80],[" (b) "sin20^(@)sin40^(@)sin.60^(@)sin80],[" (c) "(3)/(15)],[" (d) None of these "]

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

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

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

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

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)

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

(2cos40^(@)-cos20^(@))/(sin20^(@))=?