
Mark M. answered 01/31/15
Tutor
5.0
(278)
Mathematics Teacher - NCLB Highly Qualified
sin2x + sin2xcot2x = 1 Factor out the sin2x
sin2x (1 + cot2x) = 1
sin2x (csc2x) = 1
sin2x (1/sin2x) = 1
1 = 1