Check U Substitution

Replace an inner expression with u so the integral becomes simpler, then substitute back after integrating.

Formula: u = g(x); du = g′(x)dx

Calculus results depend on the function and the conditions around it. A limit, derivative, or integral should therefore be read together with its point or bounds.

The stated formula is a compact audit of what the calculator is evaluating, which makes it easier to check the output independently.