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| 1. |
Sin(pi+theta)Sin(pi-theta)cosec^2theta |
| Answer» Sin(pi+ theta)= -sin theta. becoz in third quadrant sin is -veSin(pi- theta)= sin theta. becoz in 2nd quadrant sin is +veSin( pi+theta)Sin(pi-theta)cosec^2theta = - sin theta×sin theta(cosec^2 theta)= -sin^2theta × cosec^2theta= -1Ans=-1 | |