The First Fundamental Theorem of Calculus says that an accumulation function of {{MATH_158}} is an antiderivative of {{MATH_159}}. Another way of saying this is: {{CMD_160}} {{ENV_161}} {{CMD_162}} This could be read as: {{CMD_163}}{{CMD_164}}{{CMD_165}}The {{CMD_166}} that {{CMD_167}} under a {{CMD_168}} grows is described identically by that {{CMD_169}}.{{CMD_170}} {{CMD_171}} In this form, the First Fundamental Theorem of Calculus serves as a new derivative shortcut formula to use when we differentiate accumulation functions.