If $\cos p\theta = \cos q\theta ,p \ne q$, then
If $\cos p\theta = \cos q\theta ,p \ne q$, then
- A
$\theta = 2n\pi $
- B
$\theta = \frac{{2n\pi }}{{p \pm q}}$
- C
$\theta = \frac{{n\pi }}{{p + q}}$
- D
None of these
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Let $f(x)=\cos 5 x+A \cos 4 x+B \cos 3 x$ $+C \cos 2 x+D \cos x+E$, and
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- [KVPY 2011]
The real roots of the equation $cos^7x\, +\, sin^4x\, =\, 1$ in the interval $(-\pi, \pi)$ are
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