$\frac{dy}{dx}+2xy=10x$
$15x^2-3x$
$\frac{\sin\left(4x\right)}{\sin\left(x\right)}=4\cos$
$e=tag40^{\circ}\cdot cos40^{\circ}-sen40^{\circ}$
$\left(x^4-2x^3+5x-1\right)\left(x-2\right)$
$-8\left(v-1\right)$
$\int e^{-3}dx$
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