trigonometry

Question: The maximum value of ${{\cos }^{2}}\left( \frac{\pi }{3}-x \right)-{{\cos }^{2}}\left( \frac{\pi }{3}+x \right)$ is

1) $-\frac{\sqrt{3}}{2}$

2) $\frac{1}{2}$

3) $\frac{\sqrt{3}}{2}$

4) $\frac{3}{2}$

Solution:

Explanation: No Explanation

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