If cosA = 5/13 and A is acute, find tanA.

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Accepted Answer

1. In a right triangle, $\cos A = 5/13$ means adjacent = 5 and hypotenuse = 13.
2. Find opposite: $	ext{opp} = \sqrt{13^2-5^2} = \sqrt{169-25} = \sqrt{144} = 12$.
3. So $	an A = \dfrac{	ext{opp}}{	ext{adj}} = \dfrac{12}{5}$. Choice (b) is correct.

FINAL_ANSWER: b

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Answer

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