$\lim_{x\to0}\:\frac{5x}{5^x-e^x}$
$\int\frac{x}{x\left(x-1\right)-1}dx$
$\tan\left(a\right)\csc\left(a\right)^2-\tan\left(a\right)=\cot\left(a\right)$
$\int\frac{4x-1}{x^2+9}dx$
$-55-14\cdot4+20-93:3$
$5+7-3-8+4-9$
$\frac{x+3}{6}<\frac{2x+1}{2}$
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