Question

Helpful steps please, find the phase shift of y=2cos(6x+pi).

Answer 1

http://www.shelovesmath.com/trigonometry/trig-function-tranformations/

Answer 2

easy way is to set argument equal to 0 and solve for x.

in your case:
\[6x+\pi=0 \Rightarrow 6x=-\pi \Rightarrow x=-\frac{ \pi }{ 6 }\]

Answer 3

Thanks! That helped me solve my other questions as well :)