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$\frac{sin^2x-cos^2x}{cos\:x}$
$\frac{d}{dx}y=x\cdot\:\:in\cdot\:\:y+\sqrt{sen3x}$
$\frac{3a^5-11a^3-3a^2+2}{3a^2-2}$
$\int3x^4e^{x^5+2}dx$
$\left(19z\right)^0$
$y+y\cos x=\cos x\sin x$
$\lim_{x\to0}\left(\frac{10x}{x}\right)$
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