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Real Analysis - definite integral

I have been doing Integrals, and have been successful up until this one. Please note at the end of the equation the "ds", rather than "dx" which I believe results in a different method of solving. The integral I need to find is in the picture attached.

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First of all it doesn't matter if it is dx or ds. The issue that ...

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Definite the integral calculation using the substitution method.

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