NDA Math Mock Test 02 – Question 82

Question:

Let \(f(x) = \begin{vmatrix} \cos x & x & 1 \\ 2\sin x & x^2 & 2x \\ \tan x & x & 1 \end{vmatrix}\). What is f(0) equal to?

मान लीजिए \(f(x) = \begin{vmatrix} \cos x & x & 1 \\ 2\sin x & x^2 & 2x \\ \tan x & x & 1 \end{vmatrix}\) है। f(0) किसके बराबर है?

Options:

  • -1
  • 1
  • 0
  • 2
  • -1
  • 1
  • 0
  • 2

Correct Answer: c)

Explanation:

Evaluating at \(x = 0\): \(f(0) = \begin{vmatrix} 1 & 0 & 1 \\ 0 & 0 & 0 \\ 0 & 0 & 1 \end{vmatrix} = 0\) because the second row consists entirely of zeros.

\(x = 0\) पर द्वितीय पंक्ति पूर्णतः शून्य हो जाती है, अतः सारणिक का मान 0 है।

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