$v^2dx+xdv=0$
$\frac{2senx}{cscx+\frac{2cosx}{secx}}$
$x+4+4$
$-5-6\left(-10x-5\right)$
$-3x^2+3y$
$2\cdot3^2$
$\int\frac{x^2+3x-4}{x^2-2x\left(x^2+5\right)}dx$
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