(sin^3theta-cos^3theta)/(sintheta-costhe...

`(sin^3theta-cos^3theta)/(sintheta-costheta)-(costheta)/(sqrt(1+cot^2theta))-2tanthetacottheta=-1` if

A

`theta in (0, (pi)/(2))-{(pi)/(4)}`

B

`theta in ((pi)/(2) , pi) - {(3pi)/(4)}`

C

`theta in (pi , (3pi)/(2)) -{(5pi)/(4)}`

D

`theta in (0,pi)-{(pi)/(4), (pi)/(2)}`

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