$y'+y+1=0$
$1-x^2\le-3$
$\lim_{x\to0}\left(\frac{12\cos5x}{sin3x}\right)$
$\int\frac{\left(5x^2-9\right)}{x^3-9x}dx$
$-11\cdot\left(1-4\right)$
$-6\left(-3\right)-5$
$11sin^2x-7sinx=3$
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