If $\sin\theta = 1/2$ (acute) then $\cos\theta=$

If $\sin\theta = 1/2$ (acute) then $\cos\theta=$
  1. $\sqrt{3}/2$
  2. $1/2$
  3. $\sqrt{2}/2$
  4. $1$

Solution

$\sqrt{1-1/4}=\sqrt{3}/2$.

Asked in: MH-SSC-9

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