$1+31$
$55x^6+22x^4$
$\lim_{x\to\infty}\frac{2x-1}{x}$
$\frac{1}{\sec\left(x\right)^2}=\sin^2\left(x\right)\cdot cos^2\left(x\right)\cdot\cos^4\left(x\right)$
$\lim\:_{x\to\:1}\frac{x^2+2x+1}{x^3-1}$
$-4\:\:x\:\:-1$
$\frac{4}{x^2+2x-24}$
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