Toán Lớp 11: giai pt
can 3 sinx + cosx = 2sin3x
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Toán Lớp 11: giai pt
can 3 sinx + cosx = 2sin3x
Comments ( 1 )
<=>√3/2sinx+1/2cosx=sin3x
<=>Sinx cosπ/6+cosx sinπ/6=sin3x
<=>Sin(x+π/6)=sin3x
X+π/6=3x+k2π
X+π/6=π-3x+k2π
->x=π/12+kπ
x=5π/12+k2π/3