If $5{\cos ^2}\theta + 7{\sin ^2}\theta - 6 = 0$, then the general value of $\theta $ is
If $5{\cos ^2}\theta + 7{\sin ^2}\theta - 6 = 0$, then the general value of $\theta $ is
- A
$2n\pi \pm \frac{\pi }{4}$
- B
$n\pi \pm \frac{\pi }{4}$
- C
$n\pi + {( - 1)^n}\frac{\pi }{4}$
- D
None of these
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