If `y=cos^(-1)((2x)/(1+x^2)),t h e n(dy)/(dx)i s`
`(-2)/(1+x^2)`
for all `x`
(b) `(-2)/(1+x^2)`
for all `|x|<1`
`2/(1+x^2)`
for `|x|>1`
(d) none of these
A. `(-2)/(1+x^(2))` for all x
B. `(-2)/(1+x^(2))" for all "|x|gt1`
C. `(2)/(1+x^(2))" for "|x|lt1`
D. none of these
