hello, i need help with this particular transformation, I was just wondering if my answer is correct

the transformation is this f(x) = 3 cos 2 (x - π/4) + 1 it asks me to find the period, amplitude, phase shift, which I have as π, 3 and π/4 to the right respectively. It then goes on to ask me to find the first five critical points and this is were I'm slightly confused, i have them as; (π/4, 2), (4π/4, 1), (8π/4, 2), (12π/4, 1), (16π/4, 2). My intuition tells me that these are horribly horribly horribly wrong. Could someone please enlighten me on what I am doing wrong here? I just really want a nudge in the right direction. Thank you very much.