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

Toán Lớp 11: sin ²x=1/2 Giúp mik với mik voice 5 sao

Toán Lớp 11: sin ²x=1/2
Giúp mik với mik voice 5 sao

Comments ( 2 )

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

  2. sin^2x=1/2$\\$<=>2sin^2x-1=0$\\$<=>-cos2x=0$\\$<=>2x=π/2+kπ$\\$<=>x=π/4+(kπ)/2(kinZZ)

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