MCQ
If the function $f(x) = \left\{ \begin{array}{l}
{\tan ^{ - 1}}x;x < 1\\
{\sec ^{ - 1}}x + \lambda ;x \ge 1
\end{array} \right.$ has local minima at $x = 1$, then range of $\lambda$  is-
  • A
    $\left( {0,\frac{\pi }{4}} \right]$
  • B
    $\left[ {0,\frac{\pi }{4}} \right)$
  • C
    $\left( { -  \infty ,\frac{\pi }{4}} \right]$
  • $\left( { -  \infty ,\frac{\pi }{4}} \right)$

Answer

Correct option: D.
$\left( { -  \infty ,\frac{\pi }{4}} \right)$
d

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