Question:medium
Let \(f(x) = \cos(5x)\cos(3x) - \sin(5x)\sin(3x), 0 \leq x \leq \frac{\pi}{4}\). Then \(f\) attains its minimum at \(x =\)
Let \(f(x) = \cos(5x)\cos(3x) - \sin(5x)\sin(3x), 0 \leq x \leq \frac{\pi}{4}\). Then \(f\) attains its minimum at \(x =\)
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The minimum of \(\cos(kx)\) occurs when \(kx = \pi\). If the resulting \(x\) is in your domain, that's your answer.
Updated On: Jun 25, 2026
- \(\frac{\pi}{4}\)
- \(\frac{\pi}{5}\)
- \(\frac{\pi}{6}\)
- \(\frac{\pi}{7}\)
- \(\frac{\pi}{8}\)
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The Correct Option is
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