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astro's Question
Math
Posted 5 months ago
Solve the integral intex2,dxint e^{x^2} , dx using a series expansion method.
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Answer from Sia
Posted 5 months ago
Solution by Steps
step 1
First, we need the series expansion of ex2e^{x^2}. The Taylor series expansion of ex2e^{x^2} around x=0x=0 is given by: ex2=1+x2+x42+x66+x824+O(x9) e^{x^2} = 1 + x^2 + \frac{x^4}{2} + \frac{x^6}{6} + \frac{x^8}{24} + O(x^9)
step 2
Next, we integrate the series term by term from 0 to 1: 01(1+x2+x42+x66+x824)dx \int_0^1 \left(1 + x^2 + \frac{x^4}{2} + \frac{x^6}{6} + \frac{x^8}{24}\right) dx
step 3
Integrate each term separately: 011dx=x01=1 \int_0^1 1 \, dx = x \Big|_0^1 = 1 01x2dx=x3301=13 \int_0^1 x^2 \, dx = \frac{x^3}{3} \Big|_0^1 = \frac{1}{3} 01x42dx=x51001=110 \int_0^1 \frac{x^4}{2} \, dx = \frac{x^5}{10} \Big|_0^1 = \frac{1}{10} 01x66dx=x74201=142 \int_0^1 \frac{x^6}{6} \, dx = \frac{x^7}{42} \Big|_0^1 = \frac{1}{42} 01x824dx=x921601=1216 \int_0^1 \frac{x^8}{24} \, dx = \frac{x^9}{216} \Big|_0^1 = \frac{1}{216}
step 4
Sum the results of the integrals: 1+13+110+142+1216=1105175601.4618 1 + \frac{1}{3} + \frac{1}{10} + \frac{1}{42} + \frac{1}{216} = \frac{11051}{7560} \approx 1.4618
Answer
The integral of ex2e^{x^2} from 0 to 1 using the series expansion method is approximately 1.4618.
Key Concept
Series Expansion
Explanation
The series expansion method involves expanding the function into a Taylor series and then integrating term by term. This approach is useful for functions that do not have elementary antiderivatives.

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