Quiz 4:反三角函數的微分
函數 \(f(x) = {\rm{Ta}}{{\rm{n}}^{ - 1}}x\) , \(f'(1) = ?\)
\(\frac{\pi }{4}\)
\(\frac{1}{2}\)
\(\frac{1}{3}\)
\(\frac{1}{{\sqrt 2 }}\)