APFIVE Pythagorean Identity With Sine and Cosine
If $$\sin(\alpha)=\frac{3}{5}$$ and $$\alpha$$ lies in the first quadrant, use the Pythagorean identity to determine $$\cos(\alpha)$$.
| sin(α) | cos(α) |
|---|---|
| 3/5 | ? |
A
$$\frac{2}{5}$$
B
$$\frac{3}{5}$$
C
$$\frac{1}{5}$$
D
$$\frac{4}{5}$$
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