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63 lines
2.3 KiB
63 lines
2.3 KiB
"""Tests for tools for manipulation of rational expressions. """
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from sympy.polys.rationaltools import together
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from sympy.core.mul import Mul
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from sympy.core.numbers import Rational
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from sympy.core.relational import Eq
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from sympy.core.singleton import S
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from sympy.core.symbol import symbols
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from sympy.functions.elementary.exponential import exp
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from sympy.functions.elementary.trigonometric import sin
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from sympy.integrals.integrals import Integral
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from sympy.abc import x, y, z
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A, B = symbols('A,B', commutative=False)
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def test_together():
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assert together(0) == 0
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assert together(1) == 1
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assert together(x*y*z) == x*y*z
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assert together(x + y) == x + y
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assert together(1/x) == 1/x
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assert together(1/x + 1) == (x + 1)/x
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assert together(1/x + 3) == (3*x + 1)/x
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assert together(1/x + x) == (x**2 + 1)/x
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assert together(1/x + S.Half) == (x + 2)/(2*x)
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assert together(S.Half + x/2) == Mul(S.Half, x + 1, evaluate=False)
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assert together(1/x + 2/y) == (2*x + y)/(y*x)
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assert together(1/(1 + 1/x)) == x/(1 + x)
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assert together(x/(1 + 1/x)) == x**2/(1 + x)
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assert together(1/x + 1/y + 1/z) == (x*y + x*z + y*z)/(x*y*z)
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assert together(1/(1 + x + 1/y + 1/z)) == y*z/(y + z + y*z + x*y*z)
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assert together(1/(x*y) + 1/(x*y)**2) == y**(-2)*x**(-2)*(1 + x*y)
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assert together(1/(x*y) + 1/(x*y)**4) == y**(-4)*x**(-4)*(1 + x**3*y**3)
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assert together(1/(x**7*y) + 1/(x*y)**4) == y**(-4)*x**(-7)*(x**3 + y**3)
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assert together(5/(2 + 6/(3 + 7/(4 + 8/(5 + 9/x))))) == \
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Rational(5, 2)*((171 + 119*x)/(279 + 203*x))
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assert together(1 + 1/(x + 1)**2) == (1 + (x + 1)**2)/(x + 1)**2
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assert together(1 + 1/(x*(1 + x))) == (1 + x*(1 + x))/(x*(1 + x))
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assert together(
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1/(x*(x + 1)) + 1/(x*(x + 2))) == (3 + 2*x)/(x*(1 + x)*(2 + x))
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assert together(1 + 1/(2*x + 2)**2) == (4*(x + 1)**2 + 1)/(4*(x + 1)**2)
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assert together(sin(1/x + 1/y)) == sin(1/x + 1/y)
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assert together(sin(1/x + 1/y), deep=True) == sin((x + y)/(x*y))
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assert together(1/exp(x) + 1/(x*exp(x))) == (1 + x)/(x*exp(x))
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assert together(1/exp(2*x) + 1/(x*exp(3*x))) == (1 + exp(x)*x)/(x*exp(3*x))
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assert together(Integral(1/x + 1/y, x)) == Integral((x + y)/(x*y), x)
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assert together(Eq(1/x + 1/y, 1 + 1/z)) == Eq((x + y)/(x*y), (z + 1)/z)
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assert together((A*B)**-1 + (B*A)**-1) == (A*B)**-1 + (B*A)**-1
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