求y=arctan1/x的微分详细解析
令u=1/x
y = arctan 1/x =arctanu
y'=(arctanu)'
=[1/(1+u^2)]*u'
=[1/(1+u^2)]*(-1/x^2)
=[1/(1+(1/x)^2)]*(-1/x^2)
10分
求y=arctan1/x的微分详细解析
令u=1/x
y = arctan 1/x =arctanu
y'=(arctanu)'
=[1/(1+u^2)]*u'
=[1/(1+u^2)]*(-1/x^2)
=[1/(1+(1/x)^2)]*(-1/x^2)
10分