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JEE Mains · Maths · STD 11 - Trigonometrical equations

अंतराल \(\left[\begin{array}{lll}0, & 2 \pi\end{array}\right]\) में समीकरण \(|\cot x|=\cot x+\frac{1}{\sin x}\) के हलों की संख्या है

  1. A \(1\)
  2. B \(2\)
  3. C \(3\)
  4. D \(4\)
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Answer & Solution

Correct Answer

(A) \(1\)

Step-by-step Solution

Detailed explanation

If \(\cot x>0 \Rightarrow \frac{1}{\sin x}=0\) (Not possible) If \(\operatorname{cotx}<0 \Rightarrow 2 \cot x+\frac{1}{\sin x}=0\) \(\Rightarrow 2 \cos x=-1\) \(\Rightarrow x =\frac{2 \pi}{3}\) or \(\frac{4 \pi}{3}( reject )\)
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