Calculus helps us to understand and analyze the behavior of functions more precisely than using infinitesimals because it provides a more rigorous and formal approach to studying functions. Here are a few key ways in which calculus can help us analyze functions more precisely:

1. Derivatives: Calculus provides a way to find the instantaneous rate of change of a function at any point using derivatives. Derivatives allow us to determine where a function is increasing or decreasing, where it has maxima or minima, and where it is concave up or concave down.

2. Integrals: Calculus provides a way to find the area under a curve using integrals. Integrals allow us to determine the total amount of something (such as distance traveled or volume) based on the behavior of a function.

3. Limits: Calculus provides a way to determine the behavior of a function as the input approaches a certain value using limits. Limits allow us to find asymptotes, determine the continuity of a function, and evaluate the behavior of a function as it approaches infinity or negative infinity.

4. Taylor series: Calculus provides a way to approximate functions using Taylor series. Taylor series allow us to represent a function as a sum of infinitely many terms, each of which involves higher and higher powers of the input. This can be used to approximate a function to a desired degree of accuracy.

Overall, calculus provides a more precise and rigorous way to analyze functions than using infinitesimals because it is based on a well-defined set of rules and procedures. However, infinitesimals can still be useful for gaining an intuitive understanding of calculus concepts.
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