Given that \(\theta\) is an acute angle and sin \(\theta\) = \(\frac{m}{n}\), find cos \(\theta\)...
MATHEMATICS
JAMB 1992
Given that \(\theta\) is an acute angle and sin \(\theta\) = \(\frac{m}{n}\), find cos \(\theta\)
- A. \(\frac{\sqrt{n^2 - m^2}}{m}\)
- B. \(\frac{\sqrt{(n + m)(n - m)}}{n}\)
- C. \(\frac{m}{\sqrt{n^2 - m^2}}\)
- D. \(\sqrt{\frac{n}{n^2 - m^2}}\)
Correct Answer: B. \(\frac{\sqrt{(n + m)(n - m)}}{n}\)
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