$\lim_{x\to\infty}\left(e^{-4x}\cdot\sqrt{x}\right)$
$4cos^2x+cosx-5$
$-\frac{1}{2}x^3y^2+3x^2y^2$
$3x^2+6x=45$
$4x^2+6\le0$
$\frac{\infty}{-4}$
$\int_0^{\frac{5\pi}{2}}\left(\cos\left(x\right)\right)dx$
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