1. ## complete identity, tan

2 tan A - (1+tan A)^2 = ?

hmm. Do I express tan in terms of sin/cos and go from there? thanks

2. Originally Posted by daydreembelievr
2 tan A - (1+tan A)^2 = ?

hmm. Do I express tan in terms of sin/cos and go from there? thanks
Try expanding the squared term first and then simplifying .....