The derivative of f given by f(= tan-1 x assuming it exists is :
A. \(\frac{1}{1-x^{2}}\)
B. \(\frac{1}{\sqrt{1-x^{2}}}\)
C. \(\frac{1}{1+x^{2}}\)
D. \(\frac{2 x}{1+x^{2}}\)
Answer:C
The derivative of f given by f(= tan-1 x assuming it exists is :
A. \(\frac{1}{1-x^{2}}\) B. \(\frac{1}{\sqrt{1-x^{2}}}\) C. \(\frac{1}{1+x^{2}}\) D. \(\frac{2 x}{1+x^{2}}\)