rewrite with only sin x and cos x.
sin 2x - cos 2x
a) 2 sin2x - 2 sin x cos x + 1
b) 2 sin x
c) 2 sin2x + 2 sin x cos x - 1
d) 2 sin2x - 2 sin x cos x - 1

Reading tests are compared for two students. sara got 98, 100, 65, 78, 98, 46, 100, 100, 45, and 50 on her reading test. lee got 97, 67, 89, 99, 100, 45, 79, 89, 58, and 67 on his reading test.