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# Calculus Warmups

The concepts of limits, infinitesimal partitions, and continuously changing quantities paved the way to Calculus, the universal tool for modeling continuous systems from Physics to Economics.

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Is \(f(x)= x + \sin x\) an injective function?

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Siddharth Goel**

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\[\large\sum _{ j=0 }^{ \infty }{ \sum _{ i=0 }^{ \infty }{ \frac { { 2 }^{ -(i+j) } }{ i+j+1 } } } = \ ?\]

Give your answer to 3 decimal places.

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Aditya Kumar**

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\[ \large \lim _{xy\to 1}\left(\frac{\ln\:x}{\ln\:y}+\frac{\ln\:y}{\ln\:x}\right)= \ ? \]

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Efren Medallo**

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Pi Han Goh**

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Some people claim that \( 0 ^ 0 = 1 \). What is

\[ \Large \lim_{ x \rightarrow 0^+ } x ^ { \frac{ 1}{\ln x} }?\]

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Calvin Lin**

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