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WAEC Mathematics 1995 Question 43

Question 43

Trigonometry

Without using tables, find the value of sin 20°/cos 70° + cos 25°/sin 65°

  1. A.2
  2. B.1
  3. C.0
  4. D.−1
  5. E.−2
Show the answer and explanation

Answer: A (2)

Explanation

sin 20° = cos 70° and cos 25° = sin 65° (complementary angles), so each fraction equals 1 and the sum is 2.