Question

导数是怎么求的,我导不出来,求师傅

Answer 1

[(1+x^2)^(1/2)]'

=1/2×(1+x^2)^(1/2-1)·(1+x^2)'

=1/2×(1+x^2)^(-1/2)·2x

=x(1+x^2)^(-1/2)

=x/√(1+x^2)