Create a function that will plot the entire ellipse

Question

The parametric equation for an ellipse centered at (h,k), whose major and minor axes are parallel to the x and y axes,
is x=h+a.cost, y= k+bsint.create a function that will plot the entire ellipse, given the inputs h, k, a and b.
use the function to obtain the plot for the case h=-2, k=4, a=1, b=2.