" (ii) "sin10^(@)+sin20^(@)+sin40^(@)+si...

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

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

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

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

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

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

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

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

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

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