$x^4\frac{dy}{dx}-3x^3y=x^7-x^3$
$\int x^2e^{20x}dx$
$\frac{x^2+6x+12}{x-4}$
$sen\:a\:.\:tan\:a\:.\:cot\:a$
$\frac{du}{dt}=\frac{2t+sec^2t}{2u},\:u\left(0\right)=-5$
$\sqrt{-1}^{6^{7^{8^9}}}$
$\frac{3x^2-8x^2-4x+3}{x-3}$
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