有定义运算x*y=x^2-y^2+2x,则cos(x/3)*sin(x/3)=
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有定义运算x*y=x^2-y^2+2x,则cos(x/3)*sin(x/3)=
![有定义运算x*y=x^2-y^2+2x,则cos(x/3)*sin(x/3)=](/uploads/image/z/18729649-1-9.jpg?t=%E6%9C%89%E5%AE%9A%E4%B9%89%E8%BF%90%E7%AE%97x%2Ay%3Dx%5E2-y%5E2%2B2x%2C%E5%88%99cos%28x%2F3%29%2Asin%28x%2F3%29%3D)
[cos(x/3)]*[sin(x/3)]
=cos²(x/3) -sin²(x/3) +2cos(x/3)
=cos(2x/3) +2cos(x/3)
=cos²(x/3) -sin²(x/3) +2cos(x/3)
=cos(2x/3) +2cos(x/3)
y =(cos^2) x - sin (3^x),求y'
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