Question

cos^2x = (1 - cos2x)/2
TRUE or FALSE

Answer 1

False.

Answer 2

so
cos^2(x) = 1/2-cos^2(x)/2

Answer 3

plug in pi for x and see if that is true
1 = 1/2 - 1/2 = 0

Answer 4

@ayyebigkid please explain your answer, or guide them to an answer for them selves

Answer 5

FALSE! oh thanks...

Answer 6

Okay! Sorry, I am new. :P I will do my best to explain next time!

Answer 7

But @zzr0ck3r what about this equation?

Answer 8

cos((π/2) - x) = sinx

I cannot plug in π again

Answer 9

well plugging in only works to show they are not equal, it does not show that they are.

Answer 10

Oh wait, never mind then! it is TRUE

Answer 11

I see what you mean now :) Thanks again