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

Toán Lớp 11: tập xác định y=5-2tan3x giúp với

Toán Lớp 11: tập xác định y=5-2tan3x
giúp với

Comments ( 2 )

  1. ~rai~
    \(y=5-2\tan3x\\ĐKXĐ:\cos3x\ne 0\\\Leftrightarrow 3x\ne \dfrac{\pi}{2}+k\pi\\\Leftrightarrow x\ne \dfrac{\pi}{6}+k\dfrac{\pi}{3}.(k\in\mathbb{Z})\\TXĐ:D=\mathbb{R}\backslash\left\{\dfrac{\pi}{6}+k\dfrac{\pi}{3}\Big|k\in\mathbb{Z}\right\}.\)

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

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