$\frac{cos2x}{cos^2x}=sec^2x-2tan^2x$
$16x^3-160x^2+400x+1600$
$\int\frac{2+7\sin^3\left(x\right)}{\cos^2\left(x\right)}dx$
$2x^2-12x-54$
$x^4-8x^2+7$
$\frac{16}{0.37}$
$\int\frac{3r^2-2r+1}{\sqrt{r}}dr$
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