Question

Someone please explain this to me step by step?

verify the identity cos(x+pi/2) = -sinx

Answer 1

kitty its logical you just should imagine it on the tir circle so when you say pie/2 +x so your in the second quad thus you have a negative cosine but since its pie/2 cos becomes sine soo its -sinx

Answer 2

How would I write that out in numbers?

Answer 3

if you ues the addition angle formula you get
\[\cos(x+\frac{\pi}{2})=\cos(x)\cos(\frac{\pi}{2})-\sin(x)\sin(\frac{\pi}{2})\]

Answer 4

two of those are numbers
you good from there?

Answer 5

From here which would we factor out?

Answer 6

comeee on mannn where is your logic why going through all this

Answer 7

It's our last question and we are bad with math =\