$\lim_{x\to-\infty}\frac{12x^2-9x+7}{3x^2+2}$
$1+e^{3x}y^'=0$
$\frac{\cos\left(1\right)}{\sec\left(1\right)}+\frac{\sin\left(1\right)}{\csc\left(1\right)}$
$s\left(s^2+4\right)$
$-y'+\frac{y}{x}=x$
$\left(2x-\frac{1}{2}y\right)^7$
$2a\:\left(2a+3\right)+3a\:\left(3a+2\right)$
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