$\frac{\cos\left(2x\right)-\cos\left(4x\right)}{\sin\left(2x\right)+\sin\left(4x\right)}$
$\frac{10}{z-1}-\frac{10}{z+1}=\frac{4}{z-2}-\frac{4}{z+3}$
$\left(-1576\right)^{-1576}$
$3-\left(2-\left(3\cdot4-4\right)+3\cdot\left(-5\right)\right)-10$
$\left(a-b-c-d\right)^2$
$-2.1n-8\left(-8.7n+5.4\right)$
$\frac{d}{dx}\:y=sen\left(x\right)\cos\left(3x\right)$
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