$\frac{2}{1-\sin^2x}$
$\int_{-\infty}^0\ln\left(x\right)dx$
$\frac{5x}{\left(2x+5\right)^2}+\frac{3x-2}{4x^2-25}=0$
$\lim_{x\to\infty}\left(\sqrt{7x^2-3x+4}-\sqrt{7x^2-4}\right)$
$\int\frac{6x^2-8x+3}{\left(1-x\right)^3}dx$
$7z-z$
$\frac{5}{x-3}=0$
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