$\frac{sen\left(a\right)}{cos\left(a\right)}+\frac{cos\left(a\right)}{1+sen\left(a\right)}$
$\frac{16x^4}{16x^3}$
$\frac{dy}{dx}\left(x+y^2\right)$
$x\frac{dy}{dx}+y=3$
$2x^5+x^4+x^3+0x^2+x+1\cdot2x^3-x+1\cdot x$
$\left(4x^4y^2\right)^{-3}$
$-4\sin\left(2x\right)\cos\left(2x\right)+2\cos^2\left(2x\right)$
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