$\frac{x-1}{x+1}-2\le\:\:\:0$
$-36e^{6x}\frac{dy}{dx}=-\frac{36x}{y^2}$
$\int\left(\sqrt{x}-3\right)x^3dx$
$y^{'''}-4y^{''}-5y^'=0$
$2cos^2\left(x\right)=sen2x$
$\int_{\frac{\pi}{6}}^{\frac{\pi}{2}}\left(7cot^2\left(x\right)\right)dx$
$-7-47\cdot12-\left(-7\right)$
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