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If tanalpha, tanbeta are the roots of th...

If `tanalpha, tanbeta` are the roots of the equation `x^2 + px + q = 0, (p !=0)`, then (i) `sin(alpha+beta)=-p` (ii) `tan(alpha+beta)=p/(q-1)` (iii) `cos(alpha+beta)=(1-q)` (iv) none of these

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