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

Toán Lớp 11: Giải pt sau :(2cosx-1).sin(x+π/4)=0

Toán Lớp 11: Giải pt sau :(2cosx-1).sin(x+π/4)=0

Comments ( 2 )

  1. $\begin{array}{l} \left( {2\cos x – 1} \right)\sin \left( {x + \dfrac{\pi }{4}} \right) = 0\\  \Leftrightarrow \left[ \begin{array}{l} \cos x = \dfrac{1}{2}\\ \sin \left( {x + \dfrac{\pi }{4}} \right) = 0 \end{array} \right.\\  \Leftrightarrow \left[ \begin{array}{l} x =  \pm \dfrac{\pi }{3} + k2\pi \\ x + \dfrac{\pi }{4} = k\pi  \end{array} \right.\\  \Leftrightarrow \left[ \begin{array}{l} x =  \pm \dfrac{\pi }{3} + k2\pi \\ x =  – \dfrac{\pi }{4} + k\pi  \end{array} \right.\left( {k \in Z} \right) \end{array}$  

  2. ●Giải đáp:bạn xem trên hình nha
     

    toan-lop-11-giai-pt-sau-2cos-1-sin-4-0

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

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