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

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

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(sin3theta-cos3theta)/(sintheta+costheta)+1 =

(3costheta+cos3theta)/(3sintheta-sin3theta)=

(sintheta+sin2theta)/(1+costheta+cos2theta)

(sintheta+sin2theta)/(1+costheta+cos2theta)

(sin^(3)theta+cos^(3)theta)/(sintheta+costheta)+(sin^(3)theta-cos^(3)theta)/(sintheta-costheta)=

(sintheta+sin 2theta)/(1+costheta+cos2theta)=

(sintheta+sin2theta)/(1+costheta+cos2theta) =

(sintheta+sin2theta)/(1+costheta+cos2theta)=?

(sintheta-2sin^3theta)/(2cos^3theta-costheta) = …………….