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WAEC Mathematics 1997 Question 42

Question 42

Trigonometry

Cos 65° has the same value as

  1. A.Sin 65°
  2. B.Cos 25°
  3. C.Cos 115°
  4. D.Cos 205°
  5. E.Cos 295°
Show the answer and explanation

Answer: E (Cos 295°)

Explanation

Cosine is positive in the fourth quadrant and cos(360° − θ) = cos θ, so cos 295° = cos 65°.