Question

cos(-25°) = cos25°
True
False

Ahhh! I'm so lost..

Answer 1

Hint: cos(-x) = cosx

Answer 2

cos (x) = cos (-x)

Answer 3

Make a unit circle or memorize the identities.

Answer 4

cosine can't tell the difference between \(x\) and \(-x\)

Answer 5

So...It is True..)

Answer 6

Oh okay, thanks. I get super confused with all of these & they are very scary. Lol. But thanks, y'all (:

Answer 7

same first coordinate for both \(x\) and \(-x\)

Answer 8

true