$\lim_{x\to n}\left(\frac{5-\sqrt{4+3x}}{7-x}\right)$
$\frac{1-\tan^2a}{1+\tan^2a}+1=\frac{2}{\sec^2a}$
$x^2+13x+0$
$\frac{dy}{dx}=x^2y\:y\left(1\right)=e$
$\int\:4\:ln\:9x\:dx$
$2\sin\left(z\right)+\sin\left(z\right)\tan\left(z\right)=\sin\left(z\right)$
$-36:-2$
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