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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 11: cotx=-3/căn 3. mọi người giúp mik vs

Toán Lớp 11: cotx=-3/căn 3. mọi người giúp mik vs

Comments ( 2 )

  1. ~rai~
    \(\cot x=-\dfrac{3}{\sqrt{3}}\quad(x\ne m\pi;m\in\mathbb{Z})\\\Leftrightarrow \cot x=-\sqrt{3}\\\Leftrightarrow \cot x=\cot\left(-\dfrac{\pi}{6}\right)\\\Leftrightarrow x=-\dfrac{\pi}{6}+k\pi.(k\in\mathbb{Z})\\\text{Vậy S=}\left\{-\dfrac{\pi}{6}+k\pi\Big|k\in\mathbb{Z}\right\}.\)

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222-9+11+12:2*14+14 = ? ( )