$\int\sqrt{z}\cdot z^2-6x^{-2}+2dx$
$4x^2-8x+6$
$\int_0^{\frac{1}{2}}xe^{2x}dx$
$15x^2+7x=2$
$\lim_{x\to+\infty}\frac{3}{x}-\frac{2x^2}{x^2+1}$
$\frac{1}{6-x},\:c=1$
$-cot\:t+\frac{sin\:t}{1-cos\:t}=csc\:t$
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