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

Toán Lớp 11: giải phương trình: sin (x/2-pi/4) =1

Toán Lớp 11: giải phương trình: sin (x/2-pi/4) =1

Comments ( 2 )

  1. $\begin{array}{l} \sin \left( {\dfrac{x}{2} – \dfrac{\pi }{4}} \right) = 1\\  \Leftrightarrow \dfrac{x}{2} – \dfrac{\pi }{4} = \dfrac{\pi }{2} + k2\pi \\  \Leftrightarrow x – \dfrac{\pi }{2} = \pi  + k4\pi \\  \Leftrightarrow x = \dfrac{{3\pi }}{2} + k4\pi \left( {k \in \mathbb{Z}} \right) \end{array}$ 

  2. Giải đáp:
    \sin(x/2-\pi/4)=1
    <=> x/2-\pi/4=\pi/2+2k\pi(k\in\mathbb{Z})
    <=> 2x-\pi=2\pi+8k\pi(k\in\mathbb{Z})
    <=> 2x=2\pi+\pi+8k\pi(k\in\mathbb{Z})
    <=> 2x=3\pi+8k\pi(k\in\mathbb{Z})
    <=> x=(3\pi)/2+4k\pi(k\in\mathbb{Z})

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