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

Toán Lớp 11: nghiệp của pt y= sinx -cosx= √s

Toán Lớp 11: nghiệp của pt
y= sinx -cosx= √s

Comments ( 1 )

  1. $\sin x-\cos x=\sqrt2$
    $\to \sqrt2\sin\left( x-\dfrac{\pi}{4}\right)=\sqrt2$
    $\to \sin\left(x-\dfrac{\pi}{4}\right)=1$
    $\to x-\dfrac{\pi}{4}=\dfrac{\pi}{2}+k2\pi$
    $\to x=\dfrac{3\pi}{4}+k2\pi$

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