$x^2+8x-10x-2$
$\left|\left(-8\right)\right|.\left(+2\right)-\left(+4\right)-\left(-5+\left(+2\right)\right)$
$\left(-2\right).\left(-5\right):\left(-10\right)$
$-7y^2+4y^2$
$\lim_{x\to0}\left(\frac{2e^x-4cos\left(x\right)+e^{-x}}{xsen\left(x\right)}\right)$
$4+1-9-10+6$
$4\cos^2x+1=2$
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