$\lim_{x\to\infty}\left(\sqrt{x+2}-\sqrt{x+9}\right)$
$2x\left(3x-5\right)+7x\left(1-x\right)=-10$
$\frac{3\sqrt[3]{a^2x}}{ax}$
$2\left(-\frac{1}{9}t-8\right)$
$6\:d\:+21$
$\csc\left(x\right)\sec\left(x\right)-\cos\left(x\right)$
$36z^2+4y^2-24z^2y$
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