$\sec^21570$
$\lim_{x\to0}\left(\frac{x}{x+2\sqrt{x}}\right)$
$\frac{d}{dx}\:y=\frac{5x+1}{9x-2}$
$\int_3^{\infty}\left(\frac{3cos\left(\frac{\pi}{x}\right)}{x^2}\right)dx$
$\left(3-\sin\right)\left(3+\sin\right)$
$\int_1^3\left(x^2y\right)dy$
$\left(x^2+2x+1\right)\left(4x+9\right)$
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