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

Toán Lớp 11: 7sinx-2sin2x=0 helpppppppppppppp

Toán Lớp 11: 7sinx-2sin2x=0
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Comments ( 1 )

  1. 7sinx-2sin2x=0
    ⇔7sinx-2sinxcosx=0
    ⇔sinx(7-2cosx)=0
    ⇔\(\left[ \begin{array}{l}sinx=0\\7-2cosx=0(loại)\end{array} \right.\) 
    ⇔x=k$\pi$ (k∈Z)

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

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