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GCE Mathematics 1990 Question 40

Question 40

Trigonometry

Use Mathematical tables to evaluate (cos 40° − sin 30°).

  1. A.−0.2660
  2. B.−0.0266
  3. C.0.0266
  4. D.0.2660
  5. E.1.5320
Show the answer and explanation

Answer: D (0.2660)

Explanation

cos 40° = 0.7660 and sin 30° = 0.5000, so the difference is 0.2660.