$2cot\left(2x\right)=cot\left(x\right)-tan\left(x\right)$
$2xy^2+3x^2y$
$3-2x\ge7$
$360xyz+240xyz-200xyz$
$\lim_{x\to+\infty}\left(1-\frac{4}{x}\right)^{6x}$
$\frac{y^6}{y}$
$65.311-5.917$
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