# The trigonometric equation , has a solution for- (A) $\left|a\right|\le \frac{1}{\sqrt{2}}$           (B) $\frac{1}{2}<\left|a\right|<\frac{1}{\sqrt{2}}$              (C) all real values of a        (D) $\left|a\right|<\frac{1}{2}$

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