Professor Kate Poirier | OL33 | Spring 2021

Author: Eduardo (Page 1 of 4)

Individual Practice Exam

Which topics were you most confident in?

The topics I am most confident in are: integral test, improper integrals, u-substitution, integration by parts, the divergence test and alternating series test, the area between curves and the volume of slicing, ratio & root tests, power series, Taylor polynomial & series, partial fraction decomposition

Which topics do you need to review more?

The topics I need to review more are trigonometric substitution, partial fraction decomposition, comparison tests, area approximation, and surface area.

What is your strategy for getting help with the topics you need help with before next week’s exam?

My strategy for getting help with the topics is: reworking the same problems over and over again to practice until becoming proficient, and also, attend math tutoring for clarity.

Individual Post – Test #2 Solution: Taylor Series

Problem #7 is to work with Taylor Series with given f(x) = ex centered at a =4 to find the first 5 non-zero terms. The equation ex is constant and cannot be derived interchangeably. Written as Taylor Polynomials, the polynomial formula is exxn/n! so ex = the sum of exxn/n! from n = 0 to infinity. To find the limit in determining whether the series diverges or converges, the sum is to be rewritten as a limit to apply the ratio test. By the ratio test, P = 0 so the series diverges and accordingly, the radius of convergence R = infinity.

Test #2 Individual Cheat Sheet

11-12. Taylor and Maclaurin Polynomials

13. Sequences

Arithmetic Sequence:

Geometric Sequence:

Convergence of Sequence:


14. Infinite Series

Infinite Sequence:

If a sequence is a list of numbers: … then a series is just the sum of the terms in the series: …

Infinite Series:

Geometric Series:

Partial Sum of Geometric Series:

Converging and Diverging Series:

For the infinite series

the nth partial sum is given by

If the sequence of partial sums converges to L, then the series converges where L is the sum of the series.

If diverges, then the series diverges.

Divergent Test for a Series:

 

Telescoping Infinite Series:

The telescoping series is of the form

The series will only converge if and only if approaches a finite number as n approaches infinity.

15. The Divergence and Integral Tests:

Integral Test:

  • The interval does not always need to start at 1.
  • The function does not necessarily always need to be decreasing. It needs to decrease for the x-value larger than 1.

P-Series Test:

Divergence Test:

16. Comparison Tests:

Comparison Test:

Limit Comparison Test:

17. Alternating Series Test:

Alternating Series Test:

The alternating series test applies to the alternating harmonic series because the individual terms satisfy the three conditions:

So the alternating harmonic series   converges by the alternating series test.

Absolute and Conditional Convergence:

This means that there are three possibilities for any given series: the series either converges absolutely or conditionally, or the series diverges.

18. Ratio and Root Test:

Ratio Test:

Root Test:

19. Power Series and Functions & Properties of Power Series:

Power Series:

Interval of Convergence:

20. Taylor and Maclaurin Series & Working with Taylor Series:

Taylor Series

 

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