谁的导数是1/(x²-1)½
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y'=ln [x+(1-x²)½ ]'=1/[x+(1-x²)½ ]× [x+(1-x²)½ ]‘
=1/[x+(1-x²)½ ]× [1+1/2×(1-x²)½(1-x^2)’]
=1/[x+(1-x²)½ ]× [1+1/2×(1-x²)½(-2x)]
=1/[x+(1-x²)½ ]× [1+1/2×(1-x²)½(1-x^2)’]
=1/[x+(1-x²)½ ]× [1+1/2×(1-x²)½(-2x)]
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