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Can anybody help me with these 3 problems?:

1)

Express (3x-1)/(x+3)^2 in the form A/(x+3) + B/((X+3)^2) where A and B are constants.

2)

A curve C has parametric equations:

x=cost and y=2-cos2t (between 0 and pi)

a)prove this can be expressed as the cartesian equation y=3-2x^2

b) sketch the graph of C

c) what is the t value for the maximum point on the graph

3)

The coefficients of x^2 and x in the expansion of a(1-bx)^-3 are 72 and 18 respectively.

Find a and b, given they are above 0.

I really need help with these 3. Thank You