1.

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
Answer» C. \[n\pi +{{(-1)}^{n}}\frac{\pi }{4}\]


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