$\int\frac{3}{x^2+4}dx$
$-1\cos^2x\cdot\tan^2x$
$\int3e^{x^2}dx$
$\frac{\sec\theta}{1+\sec\theta}=\frac{1-\cos\theta}{\sin^2\theta}$
$t^2-\:-10t-25$
$\left(\frac{x^{-8}}{4^{11}}\right)^{-2}$
$\lim_{x\to3}\left(7x^2-8x\right)$
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