Limit of (tan^2(x) + 2x)/(x^2 + x) as x approaches zero Calculus 1 | Summary and Q&A

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November 16, 2018
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The Math Sorcerer
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Limit of (tan^2(x) + 2x)/(x^2 + x) as x approaches zero Calculus 1

TL;DR

The video explains how to simplify complex limits by manipulating the equation and finding the limit as X approaches zero.

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Key Insights

  • πŸ”Œ Plugging in the value of the limit may not always yield a valid result.
  • πŸ˜‘ The tangent function can be converted to sine over cosine to simplify expressions.
  • ☺️ The famous limit of sine x over x as X approaches zero is widely used in simplifying limits.
  • πŸ˜‘ Manipulating the expression by dividing it by X can help simplify complex limits.
  • πŸ˜‘ The simplified expression can then be evaluated by plugging in the limit value.
  • β›” The answer to the limit is 2 in this specific example.
  • β›” Understanding the concept of famous limits is crucial in handling complex limit problems.

Transcript

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Questions & Answers

Q: What is the first step when taking a limit?

The first step is to try plugging in the value of the limit to see if it yields a valid result. In this case, plugging in zero to the original expression results in an undefined denominator.

Q: How is the tangent function converted to sine over cosine?

The tangent function is converted to sine over cosine by writing it as sine squared x minus cosine squared x, all over cosine squared x. This conversion helps simplify the expression.

Q: What is the famous limit of sine x over x as X approaches zero?

The famous limit of sine x over x as X approaches zero is equal to 1. This limit is widely recognized and can be used to simplify expressions involving sine.

Q: How is the expression further simplified using the famous limit?

By dividing the entire expression by X, the equation can be manipulated into sine squared x over x cosine squared x, all over 1 plus X. Using the famous limit, the sine squared x over x term simplifies to 1, resulting in a simplified expression.

Summary & Key Takeaways

  • The video discusses how to approach a limit by plugging in the value and simplifying the expression.

  • It demonstrates using the tangent function and converting it to sine over cosine to simplify the limit.

  • The video introduces the famous limit of sine x over x as X approaches zero and shows how it can be applied to simplify the expression further.

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