Question

Which graph represents a phase shift of pi/2 units right for the graph of y=cos x

Answer 1

Solution:

we are given that $y=cos x$

Here we are going to plot two curves one for cosx and the othere also of cosx but after making a phase shift of $\pi/2$

When we do a phase shift by an angle of theta , in that case actaully we add angle negative theta .

For example when we shift the phase of sinx by $\pi/2$ we get  $sin(x-\pi/2).$

Hence we are going to plot the curve of

$y=cosx\\ \\ y=cos(x-\pi/2)=sinx$

Hence the correct option is B.

Answer 2

Your answer is b. y = sinx

Hope I helped!
Let me know if you need anything else!
~ Zoe