若函数y=-2sin(x+φ)(0
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若函数y=-2sin(x+φ)(0若函数y=-2sin(x+φ)(0若函数y=-2sin(x+φ)(0(1)关于y轴对称将x换成-x,函数值不变.sin(x+φ)=sin(-x+φ)2sinx*cos
若函数y=-2sin(x+φ)(0
若函数y=-2sin(x+φ)(0
若函数y=-2sin(x+φ)(0
(1)关于y轴对称
将x换成-x,函数值不变.
sin(x+φ)=sin(-x+φ)
2sinx*cosφ=0,对任意x都成立
所以cosφ=0
0
若函数y=-2sin(x+φ)(0
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