$\int\left(x^3-2x^2+5\right)e^{2x+3}dx$
$\frac{\sin\left(x\right)}{\cos\left(x\right)}-\frac{1}{\cos2\left(x\right)}$
$50+2x<6x$
$\int\left(\frac{\sqrt{4x^2+1}}{x^4}\right)dx$
$45x=180+40x$
$i^2+4i+4$
$\left(5c+8\right)\left(3c-1\right)$
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