1. The problem statement, all variables and given/known data Use fundamental identities to simplify the expression: (sinx)^2 - (cosx)^2 ____________________ (sinx)^2 - (sinx cosx) *note: it's a numerator and denominator. The underscore line is the fraction line. *note: The answer in the back of the book is "1 + cotx" but I would like to know how it got there. 2. Relevant equations (sinx)^2 + (cosx)^2 = 1 other trig identities 3. The attempt at a solution (sinx)^2 - (cosx)^2 _________________ sinx(sinx - cosx) I factored out sinx out of the bottom, but I don't really see any identies that would simplify sinx-cosx. (I have a chart of identities.) I tried to simplify the top using the relevant identity I already listed. Thanks for any help!