Find a Power Series Representation for the Indefinite Integral $\int \frac { \sin 9 x } { x } d x$

Q81: Find a power series representation for

Q82: Use the sum of the first

Q83: Find the sum of the series.

Q84: Determine whether the series is absolutely

Q85: Approximate the sum to the indicated

Q87: When money is spent on goods

Q88: Determine whether the given series converges

Q89: Test the series for convergence or

Q90: Graph the sequence defined by

Q91: Determine whether the sequence defined by