$\lim_{x\to2}\left(\frac{\sin\left(x\pi\right)}{2-x}\right)$
$\frac{\left(9\sqrt{x}+9x\right)}{7x^2}$
$\frac{1}{1+\tan^2a}=\cos^2a$
$9x^2\cdot b^2-25$
$\left(x+m\right)^3$
$ln\left(y\right)\frac{dy}{dx}=x$
$9\left(x^2-10x\right)$
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