Скачать или смотреть Area under the curve equals to the arc length?

This function is special because its area under the curve is the same as the arc length!

Arc length formula:    • Arc Length (formula explained)  
How does cosh^-1(x) look like?    • Inverse cosh(x)  
Derivative of cosh^-1(x), two ways:    • Derivative of cosh^-1(x), two ways  

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