$\left(2x+3y-4\right)-\left(x-4y+1\right)$
$\left(a-b\right)^2\left(a+b\right)$
$\frac{1}{\frac{\sin\left(x\right)}{\cos\left(x\right)}+\frac{1}{\cos\left(x\right)}}=\frac{\cos\left(x\right)}{\sin\left(x\right)+1}$
$\left(12x^4+21x^3+6x-12\right)\left(3x+6\right)$
$4\cdot075$
$\lim_{x\to0}\left(\sqrt[3]{4x^2+x^3}-x\right)$
$-230-290$
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