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

Toán Lớp 11: Giúp em với ạ cos2x / 1- sinx = 0

Toán Lớp 11: Giúp em với ạ
cos2x / 1- sinx = 0

Comments ( 1 )

  1. Điều kiện xác định:
    $\begin{array}{l} 1 – \sin x > 0\\  \Leftrightarrow \sin x < 1\\  \Leftrightarrow \sin x \ne 1\\  \Leftrightarrow x \ne \dfrac{\pi }{2} + k2\pi \left( {k \in \mathbb{Z}} \right) \end{array}$
    $\begin{array}{l} \dfrac{{\cos 2x}}{{1 – \sin x}} = 0\\ \Leftrightarrow \cos 2x = 0\\ \Leftrightarrow 2x = \dfrac{\pi }{2} + k\pi \\ \Leftrightarrow x = \dfrac{\pi }{4} + \dfrac{{k\pi }}{2}\left( {k \in Z} \right) \end{array}$

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