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theta and theta(2) are two distinct valu...

`theta and theta_(2)` are two distinct values of `theta[ 0 le theta_(1) 2pi, 0 le theta_(2) lt 2pi]` satisfying the equation `sin (theta+ alpha)=(1)/(2) sin 2alpha`. Prove that, `(sin theta_(1)+ sin theta_(2))/(cos theta_(1)+ cos theta_(2))= cot alpha`. s

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