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$\frac{d}{d x} [\frac{x^{2}}{x^{2} - 4}]$ =কত?

- \frac{8 x}{{(x^{2} - 4)}^{2}}

\frac{8 x}{{(x^{2} - 4)}^{2}}

- \frac{2 x}{{(x^{2} - 4)}^{2}}

\frac{2 x}{{(x^{2} - 4)}^{2}}

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