Question

simplify the following expressions:
cos^2 (2x) + sin^2 (2x)

Answer 1

hint \[\sin^2 a + \cos^2 a = 1\]

Answer 2

as long as sin^2 and cos^2 have the same "arguments" then their sum is always 1 :)

Answer 3

oh

Answer 4

thanks

Answer 5

hehe :)

Answer 6

you're welcome ^_^