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Editor
 Sep 18, 2022
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If $4\sin^{4}\theta+\cos^{4}\theta=1$ then $\theta$=
Difficulty: Easy
A: 
$2n\pi +\frac{\pi}{2}$
B: 
$n\pi +\frac{\pi}{4}$
C: 
$n\pi$
D: 
$n\pi -\frac{\pi}{3}$
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NETNUST Entry TestMathematicsSolution of Trigonometric Equations