$\Large \frac {3^xdx}{\sqrt{1-9^x}} =$ $$(a)\;\log _e 3\sin^{-1}(3^x) \qquad (b)\;\frac{1}{log_e^3} \sin^{-1}(3^x)\qquad(c)\;\log_e3\sin^{-1}(3^{x/2})\qquad(d)\;\frac{1}{log _e3} \sin^{-1}(3^{x/2}$$

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