Cancel

Cancel[expr] cancels out common factors in the numerator and denominator of expr.

Example: Cancel[(x^2-1)/(x-1)] .

Cancel is Listable.

Cancel cancels out the greatest common divisor of the numerator and denominator.

Cancel[expr, Modulus->p] generates a result modulo p.

Cancel[expr, Extension->Automatic] allows operations to be performed on algebraic numbers in expr.

Cancel[expr, Trig -> True] treats trigonometric functions as rational functions of exponentials, and manipulates them accordingly.

See The Mathematica Book: Section 1.4.5 and Section 3.3.3.

See also: Apart, GCD.

Further Examples