All flashcards
Flashcard 1: Identify the limit of xln(x) as x approaches infinity.
Answer:
- Exponential growth dominates logarithmic growth.
Flashcard 2: Which rule is used when both the numerator and denominator approach 0?
Answer: L'Hôpital's Rule. Applies when limit has indeterminate form 00 or ∞∞.
Flashcard 3: What is the limit of x1 as x approaches 0 from the left?
Answer: −∞. Function approaches negative infinity as denominator approaches zero.
Flashcard 4: Find the limit: limx→∞2x3+3x25x3−x.
Answer: 25. Divide by x3: leading coefficients give 25.
Flashcard 5: What is the limit of xsin(x) as x approaches 0?
Answer:
- This is a fundamental trigonometric limit.
Flashcard 6: Find the limit: limx→−∞x2x2+2x+1.
Answer:
- Divide by x2: 1+x2+x21 where terms →0.
Flashcard 7: Identify the limit of exx3 as x approaches infinity.
Answer:
- Exponential growth dominates polynomial growth.
Flashcard 8: Find the limit: limx→3x−3x2−9.
Answer:
- Factor difference of squares: x−3(x+3)(x−3)=x+3.
Flashcard 9: What is the limit of xsin(x) as x approaches infinity?
Answer:
- Sine oscillates between -1 and 1 while x grows.
Flashcard 10: Find the limit: limx→0xsin(2x).
Answer:
- Use limx→0usin(u)=1 with u=2x.
Flashcard 11: What is the limit of x1 as x approaches 0 from the positive side?
Answer: +∞. Function approaches positive infinity as denominator approaches zero.
Flashcard 12: What is the limit of xn as x approaches 0 for n>0?
Answer:
- Any positive power of zero equals zero.
Flashcard 13: Find the limit: limx→0xex−1.
Answer:
- This is the derivative of ex at x=0.
Flashcard 14: Find the limit: limx→0xtan(x).
Answer:
- Equivalent to limx→0xsin(x)=1.
Flashcard 15: What is the limit of ex as x approaches negative infinity?
Answer:
- Exponential function approaches zero for large negative values.
Flashcard 16: Find the limit: limx→2πtan(x).
Answer: Does not exist. Tangent has vertical asymptotes at odd multiples of 2π.
Flashcard 17: What technique is used for limits at infinity involving polynomials?
Answer: Divide by the highest power. Standard technique for rational functions at infinity.
Flashcard 18: What is the limit of x21−cos(x) as x approaches 0?
Answer: 21. Standard limit using half-angle trigonometric identity.
Flashcard 19: What is the method for evaluating limx→∞f(x) when f(x) is a rational function?
Answer: Divide by the highest power. Divide numerator and denominator by highest degree term.
Flashcard 20: What is the limit of ln(x) as x approaches 0 from the right?
Answer: −∞. Natural logarithm approaches negative infinity at zero.
Flashcard 21: What is the limit of exx2 as x approaches infinity?
Answer:
- Exponential growth dominates polynomial growth.
Flashcard 22: What is the limit of x+1x as x approaches infinity?
Answer:
- Divide by x: 1+x11→11=1.
Flashcard 23: Find the limit: limx→0xex−1.
Answer:
- This equals the derivative of ex at x=0.
Flashcard 24: What is the limit of a constant c as x approaches any value?
Answer: c. Constants remain unchanged regardless of variable behavior.
Flashcard 25: What is the limit of ex as x approaches negative infinity?
Answer:
- Exponential function approaches zero for large negative values.
Flashcard 26: What is the limit of xtan(x) as x approaches 0?
Answer:
- Standard trigonometric limit equivalent to xsin(x).
Flashcard 27: What is the squeeze theorem used for?
Answer: Finding limits of bounded functions. Traps function between two converging bounds.
Flashcard 28: Find the limit: limx→∞2x+53x+2.
Answer: 23. Divide by highest power: 23+terms→0terms→0.
Flashcard 29: Which method is used for limits of the form 00?
Answer: L'Hôpital's Rule. Standard method for 00 indeterminate forms.
Flashcard 30: What is the limit of x2−1x−1 as x approaches 1?
Answer: 21. Factor and simplify: (x+1)(x−1)x−1=x+11.