$sea\:y=\frac{\sqrt{x}}{cos\:\left(x\right)}$
$y'-\frac{y}{x}=x\cos\left(x\right)$
$\left|-7+\frac{3}{4}\right|$
$\left(2n-5x\right)^2$
$\lim_{x\to-1}\left(\frac{x+2}{2x^2+5x+2}\right)$
$\frac{dx}{dt}=20-\frac{x}{15}$
$\left(-2x^4y^2\right)^4$
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