$3sec^3\left(x\right)-3sec^2\left(x\right)-3sec\left(x\right)+3$
$6x-4<x-1$
$\lim_{x\to0}\left(\frac{x^5}{e^{4x}}\right)$
$\ln\frac{2}{x^2+1}$
$\int e^{2x}\cdot\left(x^2-5x\right)dx$
$2x-7=-3x+18$
$3\cos2x=-1.2$
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