求这个函数导函数
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设 u = 2x² - 3,则 du/dx = 4x
设 v = 1 + x²,则 dv/dx = 2x
设 w = √v。则 dw/dv = 1/2 * 1/√v
那么,dw/dx = dw/dv * dv/dx = 1/2 * 1/√v * 2x = x/√v = x/√(1+x²)
y = u * w
dy/dx = (du/dx) * w + u * (dw/dx)
= 4x * √(1+x²) + (2x² -3)* x/√(1+x²)
= [4x*(1+x²) + (2x² - 3)*x]/√(1+x²)
= (6x³+x)/√(1+x²)
设 v = 1 + x²,则 dv/dx = 2x
设 w = √v。则 dw/dv = 1/2 * 1/√v
那么,dw/dx = dw/dv * dv/dx = 1/2 * 1/√v * 2x = x/√v = x/√(1+x²)
y = u * w
dy/dx = (du/dx) * w + u * (dw/dx)
= 4x * √(1+x²) + (2x² -3)* x/√(1+x²)
= [4x*(1+x²) + (2x² - 3)*x]/√(1+x²)
= (6x³+x)/√(1+x²)
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