\end{array}\right|=0\) in the interval \(-\frac{\pi}{4} \leq x \leq \frac{\pi}{4}\) is
A. 0
B. 2
C. 1
D. 3
Answer:C
\end{array}\right|=0\) in the interval \(-\frac{\pi}{4} \leq x \leq \frac{\pi}{4}\) is
A. 0 B. 2 C. 1 D. 3