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y′
={x′√(1-x^2)-x[√(1-x^2)]′兆好}/(1-x^2)
={√(1-x^2)-x(1-x^2)′/[2√(1-x^2)]}/(1-x^2)清猜蔽
={√(1-x^2)+2x^2/[2√(1-x^2)]}/(1-x^2)
=[√(1-x^2)+x^2/√(1-x^2)]/(1-x^2)
=(1-x^2+x^2)/[(答州1-x^2)√(1-x^2)]
=1/[(1-x^2)√(1-x^2)]。
={x′√(1-x^2)-x[√(1-x^2)]′兆好}/(1-x^2)
={√(1-x^2)-x(1-x^2)′/[2√(1-x^2)]}/(1-x^2)清猜蔽
={√(1-x^2)+2x^2/[2√(1-x^2)]}/(1-x^2)
=[√(1-x^2)+x^2/√(1-x^2)]/(1-x^2)
=(1-x^2+x^2)/[(答州1-x^2)√(1-x^2)]
=1/[(1-x^2)√(1-x^2)]。
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