$\tan \theta=\frac{1}{x}$, হলে $\sin 2 \theta=$ কোনটি?

$\frac{2 x}{1-x^{2}}$

$\frac{1-x^{2}}{1+x^{2}}$

$\frac{1+x^{2}}{1-x^{2}}$

$\frac{2 x}{1+x^{2}}$