The real roots of the equation $cos^7x\, +\, sin^4x\, =\, 1$ in the interval $(-\pi, \pi)$ are
The real roots of the equation $cos^7x\, +\, sin^4x\, =\, 1$ in the interval $(-\pi, \pi)$ are
- A
$ \{- \frac{\pi }{2}\,,\,0 \}$
- B
$\{ - \frac{\pi }{2}\,,\,0\,,\,\frac{\pi }{2} \}$
- C
$\{ \frac{\pi }{2}\,,\,0 \}$
- D
$\{ 0\,\,,\,\,\frac{\pi }{4}\,\,,\,\frac{\pi }{2} \}$
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