$a^2-2ab+b^2=\left(a+b\right)^2$
$\lim_{x\to0}\left(\frac{x\cos\left(x\right)+\sin\left(x\right)}{x^2}\right)$
$\frac{1}{\sec\left(b\right)+1}-\frac{1}{\sec\left(b\right)-1}$
$2>b+4$
$2t\times\frac{dy}{dt}-y=t+1$
$\frac{2-x}{x^2-4}$
$\frac{dy}{dx}-\frac{3y}{x}=x$
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