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In triangle ABC, right-angled at B, cos A = 5/13. What is tan A?

Competition practiceTrigonometry
  • A12/5
  • B5/12
  • C13/12
  • D12/13

Step-by-Step Solution

Take adjacent side 5 and hypotenuse 13; the opposite side is √(169 − 25) = 12. So tan A = 12/5.
Answer: A) 12/5

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