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(cos 20^(@)+8 sin 70^(@) sin 50^(@) sin ...

`(cos 20^(@)+8 sin 70^(@) sin 50^(@) sin 10^(@))/( sin^(2)80^(@))` is equal to

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(cos20^(0)+8sin70^(0)sin50^(@)sin10^(0))/(sin^(2)80^(@)) is equal to

(cos20^(@)+8sin10^(@)sin50^(@)sin70^(@))/(sin^(2)80^(@))=

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

sin 50 ^(@) - sin 70^(@) + sin 10^(@)

sin 10 ^(@) sin 50^(@) sin 70^(@) = (1)/(8).

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

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