$\int\cos4\thetad\theta$
$\int\frac{x^2}{\left(x^2+4x+9\right)^{\frac{1}{2}}}dx$
$\frac{dy}{dx}-\frac{2x}{x^2+1}y=1$
$\left(2x+3y\right)\left(5x-4y\right)$
$2x+10y-16$
$\frac{d}{dx}y^4-4x^4=6xy$
$\left(a+2\right)\left(2a+3\right)\left(a-1\right)$
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