Let e^ 105 x -e^ -105 x =4 , then the value of the cos x is
Mathematics · JEE Main · NTA Exams — Trigonometry
Let \(e^{105 x}-e^{-105 x}=4\), then the value of the cos x is
- \(\log (2+\sqrt{5})\)
- \(\log (2-\sqrt{5})\)
- \(\log (-2+\sqrt{5})\)
- None of these
Answer
(D) None of these
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