Simple Derivative
Parse a basic expression and determine its derivative, returning the new value as a string.
So simple expressions with positive values like 3x^4 will return 12x^3
and x^3 will return 3x^2
All numbers will be integers, a missing coefficient is in front of the x is 1. The exponent value will always be greater than 1.
All expressions will be in similar format
4x^7
3x^5
x^9 etc

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string math coding