y=x^2-sin2x,则dy/dx
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y=x^2-sin2x,则dy/dxy=x^2-sin2x,则dy/dxy=x^2-sin2x,则dy/dxdy/dx=2x-2cos2x
y=x^2-sin2x,则dy/dx
y=x^2-sin2x,则dy/dx
y=x^2-sin2x,则dy/dx
dy/dx
=2x-2cos2x
y=x^2-sin2x,则dy/dx
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