NumericalHard3 marks
Evaluate without using trigonometric tables, sin² 28° + sin² 62° + tan² 38° - cot² 52° + 1/4 sec² 30°
Topic: Trigonometric identities
Previous-year question practice database
Answer
Exam answer
1 =
Explanation
sin2 + sin2 + tan2 – cot2 + sec sin2 + sin2 (90°-28°) + tan2 – cot2 (90°-38°) + 1 2 4 3
( sin2 + cos2 ) + (tan2 – tan2 ) + 1 / 3 1 = + +
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