$x^2+4+5y^3+2x^2-2x^2-6+1$
$3x^2+9x<0$
$\frac{3x+3}{x^2-8x-9}$
$839^2+09$
$\frac{cos\left(arcsinex\right)}{\sqrt{1-x^2}}$
$y'+2xy=8x$
$\left(9.5\cdot10^5\right)-\left(2.3\cdot10^4\right)$
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