Integration - Primitives - Antiderivatives

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Please help to calculate: $$\int\sqrt {{r}^{2}-{x}^{2}}{dx},\quad x\in[0,r]$$ Do any method of trigonometric substitution?

Thanks.

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Use the substitution $x=r\sin t$.

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Or use the substitution x = r cosh t if you like calculus on the complex plane.