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

Toán Lớp 11: Giải phương trình `(2cos2x)/(1-sin 2x)=0`

Toán Lớp 11: Giải phương trình (2cos2x)/(1-sin 2x)=0

Comments ( 1 )

  1. ĐK: $\sin2x\ne 1\to x\ne \dfrac{\pi}{4}+k\pi$ 
    $\dfrac{2\cos2x}{1-\sin2x}=0$
    $\Rightarrow 2\cos2x=0$
    $\Leftrightarrow \cos2x=0$
    $\Leftrightarrow 2x=\dfrac{\pi}{2}+k\pi$
    $\Leftrightarrow x=\dfrac{\pi}{4}+\dfrac{k\pi}{2}$
    Đối chiếu ĐK, suy ra: $x=\dfrac{3\pi}{4}+k\pi$

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