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If `y= cos^(-1)((2x)/(1+x^(2)))`, then `(dy)/(dx)` is -A. `(-2)/(1+x^(2))` for all xB. `(-2)/(1+x^(2))` for all `|x| lt 1`C. `(2)/(1+x^(2))` for `|x| gt 1`D. none of these |
Answer» Correct Answer - B, C |
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