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sin 10^(@)+sin 20^(@) + sin 40 ^(@) + si...

`sin 10^(@)+sin 20^(@) + sin 40 ^(@) + sin 50 =` A)`sin 15^(@) +sin 75^(@)`B)`cos 15^(@) + cos75^(@)`C)`sin 70^(@) + sin 80^(@)`D)`cos 70^(@) + cos 80^(@)`

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( sin 75^(@) - sin 15^(@))/( cos 15^(@) - cos 75^(@))=

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

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@)) =

( sin 70^(@) + cos 40^(@) )/( cos 70^(@) + sin 40^(@))=

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^(@).

Prove that sin 75^(@) - sin 15^(@) = cos 105^(@) + cos 15^(@)

sin75^(@)-sin15^(@)=cos105^(@)+cos15^(@)