Question

If cos(x) = A, then cos (x + π)=


A)
A


B)
-A


C)
2A
Eliminate


D)
A + π

Answer 1

itsD right?

Answer 2

@Fandude727

Answer 3

cos(x + pi) = a + pi?

Answer 4

does this help? http://www.wolframalpha.com/input/?i=cos(x)+%3D+sin(x%2Bpi%2F2)

Answer 5

Its -A since pi = 180 i figured it out

Answer 6

Let's see.

\(\cos(A+\pi) = \cos(A)\cos(\pi) - \sin(\pi)\sin(A) = \cos(A)(-1) - (0)\sin(A)\)

Are we getting anywhere?

Answer 7

Dude i already figured it it, -a was correct since pi = a 180 degree change making a go into the next quadrant causing it to be in the negative quadrant