y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解
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y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解
y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解
y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解
y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)=1+2cos^2(x)+sin2x=2+sin2x+cos2x
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