$x4-8x-9$
$3+\left(\left(9\cdot2\right)-3\right)\cdot1\left(-2\cdot3\right)$
$\left[\:2\:-3\:-\:\left(2\:+8\right)\:-2+13\right]-4$
$\lim_{x\to0}\left(\frac{2e^{-3x}\cos\left(2x+6x-2\right)}{\sin\left(x\right)\ln\left(1-2x\right)}\right)$
$a2\:-\:49$
$y=3x^2\:-6;\:x=-2$
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