$1-\tan\left(x\right)=\frac{2\cos\left(2x\right)}{2\cos^2\left(x\right)+2\sin\left(x\right)\cos\left(x\right)}$
$\lim_{x\to\infty}\left(\frac{x^3-x^{\frac{1}{2}}}{1-x^2}\right)$
$\int x^3\left(x^2+2x\right)^3dx$
$\frac{x+1}{x-6\:}<\:7$
$-6x+2y;\:x=6;\:y=-3$
$\frac{x^4-5x^3+4x-2}{x-3}$
$a^2+43a+450$
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