Area under the curve equals to the arc length?

Описание: 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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