If $\sin heta = \dfrac{3}{5}$ and $ heta$ is in the first quadrant, …

Question

If $\sin	heta = \dfrac{3}{5}$ and $	heta$ is in the first quadrant, what is $\cos	heta$?

Accepted Answer

A. $\dfrac{4}{5}$

$\cos^{2}	heta = 1 - \sin^{2}	heta = 1 - 9/25 = 16/25 \Rightarrow \cos	heta = \pm 4/5$. First quadrant → positive → $\cos	heta = 4/5$.

Answer

$\dfrac{5}{4}$

Answer

$\dfrac{3}{4}$

Answer

$\dfrac{5}{3}$

If $\sin\theta = \dfrac{3}{5}$ and $\theta$ is in the first quadrant, what is $\cos\theta$?