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double derive(double (*f)(double), double x) {

double stepSize = 0.01;

double x1 = x stepSize; double x2 = x + stepSize; return f(x2)- f(x1)/ (2 *stepSize);

}

19. Write a function that finds the derivative of a function f at a value x. It takes a function pointer f as argument that represents the function for computing the derivative. The derivative of a function can be calculated by f(x stepsize)-f(x stepsize) 2 stepsize Use 0.01 for stepsize