$\left(3x+5y+10z\right)\left(3x+5y-10z\right)$
$\left(5x^2-6x+11\right)+\left(-x^2+4x-9\right)$
$2\sin\left(x\right).\tan\left(x\right)$
$\frac{dy}{dx}=5y-6$
$\lim_{x\to0}\left(\frac{sin\left(5x\right)}{son\left(9x\right)}\right)$
$23+7s+16-39$
$\lim_{x\to0}\left(\frac{1-\cos\left(2\right)}{3x}\right)^{6x}$
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