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def approximate_integral(self, x0, x1):
Estimates the definite integral of the function using the Taylor series expansion.
x0 - lower limit of integration
x1 - upper limit of integration
# integrals can be off by a constant since int(f(x)) = F(x) + C
value = 0
for i in range(len(self.coefficients)):
value += ((self.coefficients[i] * (1/(i+1)) * ((x1 -**(i+1))) -
(self.coefficients[i] * (1/(i+1)) * ((x0 -**(i+1)))) # integrate each term: x^n => (1/n+1)*x^(n+1)
return value
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