trigonometry

Question: If $4{{\sin }^{4}}x+{{\cos }^{4}}x=1,$then $x =$

1) $n\pi $

2) $n\pi \pm {{\sin }^{-1}}\frac{2}{5}$

3) $n\pi +\frac{\pi }{6}$

4) None of these

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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