$\lim_{x\to2}\left(\frac{\sqrt{x+6}-\sqrt[3]{x+1}-3}{x^2+6x+8}\right)$
$6x^2+31.2x+15.56$
$\int t^5e^{-2t}dt$
$3\cdot\left(5x-1\right)+\left(x-1\right)\left(x+1\right)-\left(x-1\right)^2$
$3x+21=72$
$\frac{\sin\theta}{1+\sin\theta}-\frac{\sin\theta}{1-\sin\theta}$
$6r\:+\:4r\:-r$
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