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2 sin 40^(@) sin 10^(@)=...

`2 sin 40^(@) sin 10^(@)=`

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Prove that sin10^(@) + sin20^(@) + sin 40^(@) + sin 50^(@) = sin 70^(@) + sin 80^(@)

Prove that : sin 10^(@) + sin 20^(@) + sin 40^(@) + sin 50^(@) = sin 70^(@) + sin 80^(@).

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

sin 10^(@) + sin 20^(@) + sin 40^(@) + sin 50^(@) - sin 70^(@) - sin 80^(@) =

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

(1-4 sin 10^(@) sin70^(@))/(2 sin 10^(@))=

Simplify cos 100^(@) cos 40^(@) +sin 100^(@) sin 40^(@)