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Question: Answered & Verified by Expert
The principal solution of $\cot x=\sqrt{3}$ are
MathematicsTrigonometric EquationsMHT CETMHT CET 2021 (24 Sep Shift 1)
Options:
  • A $\frac{\pi}{6}, \frac{5 \pi}{6}$
  • B $\frac{\pi}{4}, \frac{5 \pi}{4}$
  • C $\frac{\pi}{6}, \frac{7 \pi}{6}$
  • D $\frac{\pi}{3}, \frac{7 \pi}{3}$
Solution:
1226 Upvotes Verified Answer
The correct answer is: $\frac{\pi}{6}, \frac{7 \pi}{6}$
$\begin{aligned} & \cot x=\sqrt{3} \quad \Rightarrow \quad \tan x=\frac{1}{\sqrt{3}} \\ & \therefore \frac{1}{\sqrt{3}}=\tan \left(\pi+\frac{\pi}{6}\right)=\tan \left(\frac{\pi}{6}\right) \\ & \Rightarrow \frac{1}{\sqrt{3}}=\tan \left(\frac{7 \pi}{6}\right)=\tan \left(\frac{\pi}{6}\right)\end{aligned}$

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