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JAMB Mathematics 2014 Question 37

Question 37

Trigonometry

If sin θ = 12/13, find the value of 1 + cos θ.

  1. A.5/13
  2. B.25/13
  3. C.18/13
  4. D.8/13
Show the answer and explanation

Answer: C (18/13)

Explanation

With opposite 12 and hypotenuse 13, the adjacent side is 5, so cos θ = 5/13. Then 1 + 5/13 = 18/13.