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

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

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

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

prove that sin10^(0)+sin20^(0)+sin40^(@)+sin50^(0)=sin70^(0)+sin80^(@)

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

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

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

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

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