Apart
 Usage
• Apart[expr] rewrites a rational expression as a sum of terms with minimal denominators.
• Apart[expr, var] treats all variables other than var as constants.
Notes
• Example: Apart[(x^2+1)/(x-1)]  . • Apart gives the partial fraction decomposition of a rational expression. • Apart[expr, var] writes expr as a polynomial in var together with a sum of ratios of polynomials, where the degree in var of each numerator polynomial is less than that of the corresponding denominator polynomial. • Apart[(x + y)/(x - y), x] . • Apart[(x + y)/(x - y), y] . • Apart[expr, Trig -> True] treats trigonometric functions as rational functions of exponentials, and manipulates them accordingly. • New in Version 1.
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