112. The derivative of the function $y = \cos^2(\tan^{-1}x)$, at $x = 1$, is which of the following? (1) $-\dfrac{1}{2}$ (2) $-\dfrac{1}{4}$ (3) $\dfrac{1}{4}$ (4) $1$
\textbf{112.} The derivative of the function $y = \cos^2(\tan^{-1}x)$, at $x = 1$, is which of the following?
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(1) $-\dfrac{1}{2}$ \hfill (2) $-\dfrac{1}{4}$ \hfill (3) $\dfrac{1}{4}$ \hfill (4) $1$
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