Integrate a polynomial

You will write the power rule as code. A polynomial is stored as a list of coefficients, lowest power first, so [5, -4, 6] means $5 - 4x + 6x^2$.

The idea. The power rule sends the term $c\,x^k$ to $\dfrac{c}{k + 1}x^{k+1}$. The new list starts with a $0$ for the constant term, and a later step sets that constant from a point on the curve.

Your tasks.

1. Finish antiderivative(coeffs). Return the list of the antiderivative with constant term 0.
2. Finish evaluate(coeffs, x). Return the value of the polynomial at x.
3. Finish curve_through(coeffs, x0, y0). Return the antiderivative list whose curve passes through (x0, y0).