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If sintheta1sintheta2-costheta1costheta2...

If `sintheta_1sintheta_2-costheta_1costheta_2+1=0,` then the value of `tan((theta_1)/2)cot((theta_2)/2)` is equal to (a)`-1` (b)` 1` (c) `2 `(d) `-2`

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