$sen2xsenx$
$\frac{d^{27}}{dx^{27}}\left(-2sin\left(x\right)\right)$
$18y^3+6x^2y+4xy^2-10xy$
$14+\left(-6\right)-\left(-9\right)$
$\frac{4x^7}{2x^2}$
$-5y-4y+y$
$6a+5b+6b$
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