Join thousands of students who trust us to help them ace their exams!Watch the first video
Multiple Choice
Evaluate the indefinite integral as a power series: .
A
+ C
B
+ C
C
+ C
D
+ C
Verified step by step guidance
1
Recognize that the given integral \( \int \frac{1}{1 - t^9} \, dt \) involves a geometric series expansion. Recall that the geometric series \( \frac{1}{1 - x} = \sum_{n=0}^{\infty} x^n \) for \( |x| < 1 \). Here, \( x = t^9 \).
Substitute \( t^9 \) for \( x \) in the geometric series expansion. This gives \( \frac{1}{1 - t^9} = \sum_{n=0}^{\infty} t^{9n} \).
Integrate term by term. The integral of \( t^{9n} \) is \( \frac{t^{9n+1}}{9n+1} \), assuming \( 9n+1 \neq 0 \). Add the constant of integration \( C \) at the end.
Write the resulting power series after integration: \( \int \frac{1}{1 - t^9} \, dt = \sum_{n=0}^{\infty} \frac{t^{9n+1}}{9n+1} + C \).
Verify the result by differentiating the power series \( \sum_{n=0}^{\infty} \frac{t^{9n+1}}{9n+1} \). Differentiating term by term should yield \( \frac{1}{1 - t^9} \), confirming the correctness of the solution.