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ECAT Mathematics QUESTION #768
Question 1
The solution of \(1 + \cos x = 0\) is:
  • \(\pi + 2k\pi,\ k \in \mathbb{Z}\)✔️
  • \(\pi - 2k\pi\)
  • \(2k\pi\)
  • None
Correct Answer Explanation
\(1 + \cos x = 0 \Rightarrow \cos x = -1 \Rightarrow x = \pi + 2k\pi,\ k \in \mathbb{Z}\).