Simple Derivative
Parse a basic expression and determine its derivative. Return the new value as a string. 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.

Expressions will be in a similar format: 4x^7 3x^5 x^9 etc

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string math coding