d(∫(2,x²))√(1-t²)dt/dX=2x√(1-x^4) ,
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d(∫(2,x²))√(1-t²)dt/dX=2x√(1-x^4) ,
d(∫(2,x²))√(1-t²)dt/dX=2x√(1-x^4) ,
d(∫(2,x²))√(1-t²)dt/dX=2x√(1-x^4) ,
∵d(∫(2,x²))√(1-t²)dt/dx=√(1-x^4)*2x=2x√(1-x^4) ∴题目正确