With the help of sympy.subs() method, we can substitute the value of variables in the various mathematical functions by using the sympy.subs() method.
Syntax :
sympy.subs(source, destination)
Return : Return the same expression by changing the variable.
Example #1 :
In this example we can see that by using the sympy.subs() method, we can substitute the value of existing variable to the new variable.
# import sympy from sympy import *
# symbol declaration x, y = symbols('x y')
gfg_exp = cos(x) + 1
# use the method sympy.subs() gfg_exp = gfg_exp.subs(x, y)
print(gfg_exp)
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Output :
cos(y) + 1
Example #2 :
# import sympy from sympy import *
# symbol declaration x, y = symbols('x y')
gfg_exp = cos(x) + 1
# use the method sympy.subs() gfg_exp = gfg_exp.subs(x, 0)
print(gfg_exp)
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Output :
2