Hey,

I need some help with the following questions:

a) Write down the Cartesian equation of the curve C represented by the parametric equations x=acos(theta) and y=bsin(theta), a>b>0

b) Find an expression for the gradient of the tangent to C

c) Hence show that the equation of the tangent can be written in the form:

bxcos(theta) + aysin(theta) = ab

I would really appreciate it

Thanks in advance