$4x=x^2$
$\lim\:_{x\to\:3}\:\left(\frac{x-50}{x^2-6x+9}\right)$
$\frac{\sin x}{\csc x}+\frac{\cos x}{\sec x}=\sin^2x+\cos^2x$
$\left(2x-6\right)\left(x-3\right)$
$\left(u+v\right)^3$
$\left(7d-64\right)^2$
$s^3+9s^2+23s+15$
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