The function \( f(x)=\frac{\cos x-\sin x}{\cos 2 x} \) is not defin...

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The function \( f(x)=\frac{\cos x-\sin x}{\cos 2 x} \) is not defined at
\( \mathrm{P} \)
\( x=\frac{\pi}{4} \) the value of \( f\left(\frac{\pi}{4}\right) \) so that \( f(x) \) is continuous
W
everywhere is
(1) 1
(2) -1
(3) \( \sqrt{2} \)
(4) \( \frac{1}{\sqrt{2}} \)
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