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CBSE XII
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Math
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Matrices
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if $A = \begin{bmatrix} cos\alpha & -sin\alpha \\ sin\alpha & cos\alpha \end{bmatrix} $ then $ A + A' = I, $ if the value of $\alpha$ is
$$\begin{array}{1 1} (A) \; \frac{\pi}{6} & (B) \; \frac{\pi}{3} \\ (C) \; \pi & (D) \; \frac{3\pi}{2} \end{array} $$
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