Question:medium

If $\sin \theta = \frac{3}{5}$, then find $\cos \theta$. [$\sin^2\theta + \cos^2\theta = 1$]

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Recognize the Pythagorean Triple: (3, 4, 5). If $\sin\theta$ is $3/5$, then the sides are 3 (opposite) and 5 (hypotenuse). The adjacent side must be 4, so $\cos\theta$ is $4/5$.
Updated On: May 13, 2026
  • $\frac{4}{5}$
  • $\frac{5}{4}$
  • $\frac{3}{4}$
  • $\frac{2}{5}$
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The Correct Option is A

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