$\lim_{x\to\infty}\:2^n+1$
$sec\left(x\right)tan\left(x\right)cot^2\left(x\right)=\frac{1}{sin\left(x\right)}$
$\int\sec\left(\frac{1}{2}\right)ydy$
$8xy-xy$
$x^2-2x+4\ge0$
$\frac{5b}{d}+25d-ab$
$-2\cdot\left(x-1\right)\cdot\left(x+1\right)\cdot\left(x+3\right)$
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