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JEE Mains · Maths · STD 11 - Trigonometrical equations

સમીકરણ \(1 + {\sin ^4}\,x = {\cos ^2}\,3x\) ના \(x\,\in \,\left[ { - \frac{{5\pi }}{2},\frac{{5\pi }}{2}} \right]\) માં ઉકેલો ની સંખ્યા મેળવો

  1. A \(3\)
  2. B \(4\)
  3. C \(5\)
  4. D \(7\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(5\)

Step-by-step Solution

Detailed explanation

\(1\, + \,{\sin ^4}x\, = \,{\cos ^2}3x\) \(\sin \,x\, = \,0\) and \(\cos \,3x\, = 1\) \(0,\,\,2\pi ,\, - \,2\pi ,\, - \,\pi ,\pi \)
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