1.

Find the principalvalue of `tan^(-1){sin(-pi/2)}`A. `(pi)/(4)`B. `-(pi)/(4)`C. `(3pi)/(4)`D. `(3pi)/(4)`

Answer» We know that sin`-(pi)/(2)=-1`
`therefore tan^(-1){sin(-pi)/(2)}=tan^(-1)(-1)=-(pi)/(2)`


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