y=[arctan(x/2)]^2,求它的导数

y'=2[arctan(x/2)][arctan(x/2)]'
=2[arctan(x/2)][1/(1+x²/4)](x/2)'
=2[arctan(x/2)][1/(1+x²/4)](1/2)
=4arctan(x/2)/(4+x²)

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