Practise integrals for Class 11-12 with timed rounds, instant feedback and difficulty that adapts as you play.
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Mathematics
Integration reverses differentiation and measures accumulated quantities such as area under a curve.
Definite and indefinite integrals carry heavy weight in Class 12 boards and every engineering entrance paper.
An indefinite integral returns a family of functions plus a constant; a definite integral returns a number, evaluated between limits.
Because differentiating any constant gives zero, so infinitely many antiderivatives differ by a constant.