Integral calculus Community Questions Indefinite and definite integrals Indefinite integral as anti-derivative. Definite integral as area under a curve. Integration by parts. U-substitution. Trig substitution. Solids of revolution Using definite integrals with the shell and disc methods to find volumes of solids of revolution. Sequences, series and function approximation Sequences, series and approximating functions. Maclaurin and Taylor series. AP Calculus practice questions Sample questions from the A.P. Calculus AB and BC exams (both multiple choice and free answer).