Question

x = -135, cos 2x = 1 - 2 sin2x

True
False
I think its true, but when I was using the unit circle, I couldnt find -135

Answer 1

@Chlorophyll can you help me, please?

Answer 2

hi friend, your problem is \[\cos 2x = 1 - 2 \sin^2 x ?\]

Answer 3

if mine is right, so, the answer is true. if yours is right, the answer is false.
why? because we have a formula for that trig: it's mine. it's true with any value of x.
Hope this helps

Answer 4

Thanks you, I was having a big problem with this, and I moved to the next questions. Thank YOU SO MUCH!

Answer 5

thanks for your medal.