Simplify the following text for a Grade 6 native English-speaking person.
Original: Several methods exist for the calculation of Taylor series of a large number of functions . One can attempt to use the Taylor series as-is and generalize the form of the coefficients , or one can use manipulations such as substitution , multiplication or division , addition or subtraction of standard Taylor series to construct the Taylor series of a function , by virtue of Taylor series being power series .
Simplified: Taylor series come from Taylor 's theorem .