$4.3^2$
$\lim_{x\to3}\left(\frac{x^3-3x^2+x-3}{x^2+3x}\right)$
$\frac{1-\tan^2}{\sec^2-2\tan}$
$\int\left(\frac{2x-1}{x^2-x+3}^2\right)dx$
$16x^2,4yx^2$
$\lim_{x\to\infty}\frac{x^2\cdot\:\left(x+17\right)^2}{2x^3+17}$
$29+-332+16$
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