Table of contents
- 0. Fundamental Concepts of Algebra3h 29m
- 1. Equations and Inequalities3h 27m
- 2. Graphs1h 43m
- 3. Functions & Graphs2h 17m
- 4. Polynomial Functions1h 54m
- 5. Rational Functions1h 23m
- 6. Exponential and Logarithmic Functions2h 28m
- 7. Measuring Angles40m
- 8. Trigonometric Functions on Right Triangles2h 5m
- 9. Unit Circle1h 19m
- 10. Graphing Trigonometric Functions1h 19m
- 11. Inverse Trigonometric Functions and Basic Trig Equations1h 41m
- 12. Trigonometric Identities 2h 34m
- 13. Non-Right Triangles1h 38m
- 14. Vectors2h 25m
- 15. Polar Equations2h 5m
- 16. Parametric Equations1h 6m
- 17. Graphing Complex Numbers1h 7m
- 18. Systems of Equations and Matrices3h 6m
- 19. Conic Sections2h 36m
- 20. Sequences, Series & Induction1h 15m
- 21. Combinatorics and Probability1h 45m
- 22. Limits & Continuity1h 49m
- 23. Intro to Derivatives & Area Under the Curve2h 9m
22. Limits & Continuity
Finding Limits Algebraically
Struggling with Precalculus?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Find the limit.
limx→−πxsinx
A
−π1
B
0
C
π
D
Does not exist

1
Step 1: Understand the problem. We need to find the limit of the function \( \frac{\sin x}{x} \) as \( x \) approaches \( -\pi \).
Step 2: Recall the limit properties. The limit of a function \( \frac{f(x)}{g(x)} \) as \( x \) approaches a point can be found if both \( f(x) \) and \( g(x) \) approach a finite value and \( g(x) \neq 0 \).
Step 3: Evaluate the behavior of \( \sin x \) and \( x \) as \( x \) approaches \( -\pi \). Note that \( \sin(-\pi) = 0 \) and \( x \) approaches \( -\pi \).
Step 4: Consider the form \( \frac{0}{-\pi} \). Since \( \sin(-\pi) = 0 \), the numerator approaches 0, and the denominator approaches \( -\pi \), which is a non-zero constant.
Step 5: Conclude that the limit exists and is equal to \( \frac{0}{-\pi} \).
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