y=根号下(cosx²)求导
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y = [根号下(cosx²)]'
=[(cosx²)^(1/2)]'
= (1/2)×(cosx²)^(-1/2)×(cosx²)'
= (1/2)×(cosx²)^(-1/2)×(-sinx²)×(x²)'
= (1/2)×(cosx²)^(-1/2)×(-sinx²)×(2x)
= (cosx²)^(-1/2)×(-sinx²)×(x)
= - x(cosx²)^(1/2)×sinx²/cosx²
= -x(cosx²)^(1/2)× tan(x²)
=[(cosx²)^(1/2)]'
= (1/2)×(cosx²)^(-1/2)×(cosx²)'
= (1/2)×(cosx²)^(-1/2)×(-sinx²)×(x²)'
= (1/2)×(cosx²)^(-1/2)×(-sinx²)×(2x)
= (cosx²)^(-1/2)×(-sinx²)×(x)
= - x(cosx²)^(1/2)×sinx²/cosx²
= -x(cosx²)^(1/2)× tan(x²)
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