$xdy-5secydx=0$
$\sqrt[10]{50^{50}}$
$\lim_{x\to\frac{\pi}{2}}\left(4cos\left(5x\right)sec\left(-3x\right)\right)$
$\lim_{x\to-\infty}\left(\frac{x^3}{x^4+27}\right)$
$\left(25-a\right)\left(25+a\right)$
$40+40+2$
$3x^2-2x-15<0$
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