The Fundamental Theorem of Calculus (part 2): Suppose f is continuous on [a, b], then
∫abfxdx=Fb-F(a), where F is antiderivative of f, that is F'=f.
Taking constant outside the integral,
∫-55π dx= π∫-551·dx
By using the antiderivative and applying the Fundamental Theorem of Calculus,