If $\cos\theta=12/13$ (acute), $\sin\theta=$

If $\cos\theta=12/13$ (acute), $\sin\theta=$
  1. $5/13$
  2. $12/13$
  3. $13/12$
  4. $13/5$

Solution

$\sqrt{1-144/169}=5/13$.

Asked in: MH-SSC-9

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