已知实数x,y满足x^2+y^2=1,则x+y的取值范围是___;x-√3y的取值范围是___
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已知实数x,y满足x^2+y^2=1,则x+y的取值范围是___;x-√3y的取值范围是___
![已知实数x,y满足x^2+y^2=1,则x+y的取值范围是___;x-√3y的取值范围是___](/uploads/image/z/9479343-39-3.jpg?t=%E5%B7%B2%E7%9F%A5%E5%AE%9E%E6%95%B0x%2Cy%E6%BB%A1%E8%B6%B3x%5E2%2By%5E2%3D1%2C%E5%88%99x%2By%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF___%3Bx-%E2%88%9A3y%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF___)
令x=cosa y=sina
x+y=cosa+sina=√2sin(x+π/4)
-1≤sin(x+π/4)≤1
-√2≤x+y≤√2
x-√3y=cosa-√3sina=2[cosasin(π/6)-cos(π/6)sina]=2sin(π/6-a)
-1≤sin(π/6-a)≤1
-2≤x-√3y≤2
已知实数x,y满足x^2+y^2=1,则x+y的取值范围是( [-√2,√2] );
x-√3y的取值范围是( [-2,2] ).
x+y=cosa+sina=√2sin(x+π/4)
-1≤sin(x+π/4)≤1
-√2≤x+y≤√2
x-√3y=cosa-√3sina=2[cosasin(π/6)-cos(π/6)sina]=2sin(π/6-a)
-1≤sin(π/6-a)≤1
-2≤x-√3y≤2
已知实数x,y满足x^2+y^2=1,则x+y的取值范围是( [-√2,√2] );
x-√3y的取值范围是( [-2,2] ).
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