use

Expand this and compare with , what can you deduce?determine whether the equation is an identity. if an identity prove it.

(sinx+cosx)^2=1

Try using andfind all solutions in [0,2pi)

tanxsecx=squareroot of 2.

Pull out a and solve each part individually (set them equal to zero)2sinxcosx+cosx=0

thank you so much in advanced!!!!!

Good luck