Quotient Properties Pythagorean Properties sinx sing x + cos2 x = 1 tan x = cOS X coty = cosx sin x tan' x + 1 = sec2 x 1 + cot2 x = csc2 x For problems 7 and 8, write formal proofs that include statements and justifications. In addition to correctness, your proof will be graded on clarity and form. 6. Prove sin x(cscx - sin x) = cos2 x