$\left(19\right)\left(12\right)-\left(10+9\right)\left(10+2\right)$
$-1.301.\frac{46}{12}$
$3a^2\cdot6ab$
$\lim_{x\to0}\left(1+7x\right)^{\frac{3}{x}}$
$tan\left(x\right)-\frac{cos\left(x\right)}{1-sin\left(x\right)}$
$-2\left(3x-2\right)-3\left(4x+5\right)$
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