Level:
Project ID:
2010015210
Source Problem:
Accepted:
0
Clonable:
1
Easy:
0
Given a right-angled triangle \( ABC \) with the right angle at vertex \( C \), calculate \( \cos\beta \) if \(\sin\alpha=\frac4{7} \).
\( \frac4{7} \)
\( \frac7{4} \)
\( \frac{\sqrt{33}}{7} \)
\( \frac7{\sqrt{33}} \)