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[sin20''sin40''sin60^(@)sin80^(@)=],[[" ...

[sin20''sin40''sin60^(@)sin80^(@)=],[[" (a) "-3/16," (b) "5/16," (c) "3/16," (d) "-5/16]]

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

sin20sin40sin80

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

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

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)

sin 40^(@) - sin 80^(@)+ sin 160^(@) =

sin^(3)20^(@)+sin^(3)40^(@)-sin^(3)80^(@)=

Prove that sin 20 ^(@) sin40^(@) sin 60^(@) sin 80^(@) = 3/16