$x^2=2$
$\frac{9b^2}{21bd+3d}$
$2\sec^{2}\theta=3-\tan\theta$
$\lim_{x\to\infty}\left(\frac{1-x}{\cos\left(x\right)}\right)$
$-9x^2-4x$
$1.x^2=5x-6$
$\frac{20r^{4}}{5\left(r^{3}\right)^{3}}$
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