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Find the area enclosed by the ellipse
`x=a cos(t)`, `y = b sin(t)` with `0 <= t <=2 pi`.
`x=a cos(t)`, `y = b sin(t)` with `0 <= t <=2 pi`.
Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question
`pi a b`