নিচের কোনটি সঠিক?

$\int \frac{f^{\prime}(x) d x}{f(x)}=\ln f(x)$

$\int \frac{\frac{1}{2} f^{\prime}(x) d x}{\sqrt{\{f(x)\}}}=\sqrt{\{f(x)\}}$

$\int \frac{\mathrm{dx}}{\sqrt{\mathrm{a}^{2}-\mathrm{x}^{2}}}=\sin ^{-1} \frac{\mathrm{x}}{\mathrm{a}}$

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