设函数 f(x)=sin(2x+y),(-π

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设函数f(x)=sin(2x+y),(-π设函数f(x)=sin(2x+y),(-π设函数f(x)=sin(2x+y),(-πf(x)=sin2(x+y/2)由于sin2x对称轴为π/4+kπ/2;故

设函数 f(x)=sin(2x+y),(-π
设函数 f(x)=sin(2x+y),(-π

设函数 f(x)=sin(2x+y),(-π
f(x)=sin2(x+y/2)
由于sin2x对称轴为π/4+kπ/2;
故x+y/2=π/4+kπ/2 x=π/4+kπ/2-y/2;
将x=x=π/8代入,得y=π/4+kπ,根据y的范围可知：y=-3π/4；

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