$\frac{4x+7}{x^5+x}$
$2n+4$
$t^2=\frac{\left(4\pi\:\cdot\:r^2\cdot\:l\right)}{g}$
$\lim_{x\to\pi}\left(\frac{x}{\cos\left(x\right)+1}\right)$
$x^2-2x-15\ge0$
$3cos^2\left(x\right)-4cos\left(x\right)-4$
$\frac{9}{x\cdot\left(x^2+9\right)}$
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