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| 1. |
If $\cos \theta=-\frac{1}{\sqrt{2}},$ then $\cdot \theta^{\prime}$ is equal to :\begin{array}{lll}{\text { (A) } \frac{\pi}{3}} & {\text { (B) }-\frac{\pi}{3}} & {\text { (C) } \frac{2 \pi}{3}} & {\text { (D) } \frac{\pi}{6}}\end{array} |
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