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Assertion (A) : If $\sin A = \frac{1}{3}$ ($0^\circ < A < 90^\circ$), then the value of $\cos A$ is $\frac{2\sqrt{2}}{3}$. Reason (R): For every angle $\theta$, $\sin^2\theta + \cos^2 \theta = 1$.
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(A) Both Assertion (A) and (R) are true. Reason (R) is the correct explanation of Assertion (A)