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[sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)...

[sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin79^(@)],[3 pi]

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

(i) sin10^(@)sin50^(@)sin70^(@)

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

sin10^(@)sin30^(@)sin50^(@)sin70^(@)sin90^(@)=

Prove that sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@) .

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

sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) sin 90^(@)=

sin50^(@)-sin70^(@)+sin10^(@)=?

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