Thanks to those who realised that I had typed the question wrong... here is the correct version

Please may someone help me solve this question:

A curve is defined by the parametric equations

x = 5 + 2cosθ, y = 3cos2θ

a) Show that dy/dx = 6cosθ

b) Verify that 2(y+3) = 3(x-5)^2 is a cartesian equation for the curve

Thank you so much !