Create a function that takes a mathematical expression as a string, list of numbers on which the mathematical expression is to be calculated and return the result as a list of string.
mathematical("f(y)=y+1",[1,2]) ➞ ["f(1)=2","f(2)=3"]
mathematical("f(y)=y^2",[1,2,3]) ➞ ["f(1)=1","f(2)=4","f(3)=9"]
mathematical("f(y)=yx3",[1,2,3]) ➞ ["f(1)=3","f(2)=6","f(3)=9"]
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