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74h Math
Question 14
2016 December(74H) Math Question 14
Trigonometry
- Pythagorean Theorem & sin cos tan
Choice H
We know that $$sin^2x\ + cos^2x=1\\$$ $$\Rightarrow cos^2x=1-sin^2x=1-\frac{4}{13}=\frac{9}{13}$$
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