$4x-2y+8=0$
$\left(x^2+y^2\right)\frac{dy}{dx}=-x^2-y^2$
$\lim_{x\to0}\left(\frac{\sin\left(\cos\:\left(2x\right)-1\right)}{2x\cdot\sin\left(4x\right)}\right)$
$\left(3x^2-1\right)-\left(x^2+9x\right)$
$4\cdot14:\left(-2\right)+9\cdot\left(-3\right)-2:\left(-2\right)$
$4x\left(4x^3-2\right)+12x^2\left(2x^2+5\right)$
$2x^3-4x^4+2x^2$
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