$\left(4-x\right)\left(1+2x\right)^{\frac{1}{2}}$
$x^3-12x+16$
$\lim_{x\to\infty}\left(\frac{e^{2x}-2x-1}{1-cosx}\right)$
$-1-2^2$
$x^2+2\le0$
$\frac{x}{5}-2<6$
$\int e^{\frac{15}{4}x}\cdot\cos\left(4x\right)dx$
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