help!

(a) Describe the graph of the parameterization $x=1-cos\left(2t\right),\:y=cos\:t$.

(b) Describe the graph of the equation $\rho =sin\:\phi \left(6cos\theta \:-\:8sin\theta \right)$ in spherical coordinates.

(c) Parameterize the equation $9x^2-36x+4y^2+24y+36=0$.

(d) Parametrize the equation $3x^2+4y^2-5z^2=0$ using two parameters.