
Bobosharif S. answered 04/12/18
Tutor
4.4
(32)
Mathematics/Statistics Tutor
Is think it should be + instead of -in (2tanθcos2θ-tanθ/1+tan2θ). Then
(2tanθcos2θ-tanθ/1+tan2θ)=
=tanθ(2cos2θ-1/(1+sin2θ/cos2θ) = tanθ(2cos2θ-cos2θ) =tanθcos2θ.