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If tantheta1,tantheta2,tantheta3 are th...

If `tantheta_1,tantheta_2,tantheta_3` are the real roots of the `x^3-(a+1)x^2+(b-a)x-b=0,w h e r e""theta_1+""theta_2+""theta_3 in (0,pi)` , then `""theta_1+""theta_2+""theta_3` , is equal to `pi//2` b. `pi//4` c. `3pi//4` d. `pi`

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