I have a calc test tomorrow, and as I was studying, there were some problems I couldn't figure out. Can anyone help me with these, please..?

1) Find the equations of the two tangent lines to the graph of

that pass through the point (-2,-9)

2) Consider the curve defined by the equation

for 0 less than or equal to y less than or equal to 2pi

a) find dy/dx in terms of y

b) Write an equation for each vertical tangent to the curve.

c) Find d^2y/dx^2 in terms of y

thanks so much for the help! i really need it, hehe:]