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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

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@Chlorophyll can you help me, please?
hi friend, your problem is \[\cos 2x = 1 - 2 \sin^2 x ?\]
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

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

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