$\int\sec^{3}\thetad\theta$
$\lim_{x\to\infty}\left(x^2-5x+7\right)$
$6x^2-5y^2+12x-30y-9=0$
$\lim_{x\to0}\left(\frac{\arctan\left(x^2\right)}{2x^2-1}\right)$
$2x-3\le4x+7$
$21x^2-2x-3$
$\left(\sqrt{\frac{x}{y}}+\sqrt{\frac{y}{x}}\right)^2$
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