$\frac{5x^2-23}{x+4}$
$\frac{cosy-cos\left(y+2q\right)}{2sinq}=sin\left(y+q\right)$
$\left(a+b\right)^2=\:4\:ab$
$\left(5x+\right)^3$
$17^2\cdot\left(-2\right)$
$9s^2+-+4t^2$
$\lim_{x\to\infty}\left(x^3-2x^2\ln\left(x\right)\right)$
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