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sin40^(@)-sin200^(@)+sin280^(@)=...

`sin40^(@)-sin200^(@)+sin280^(@)=`

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

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

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

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

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

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

Show that cos 340^(@) cos 40^(@)+sin 200^(@) sin 140^(@) = 1/2 .