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Question
cos267° + cos223° = ......
Fill in the Blanks
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Solution
cos267° + cos223° = 1.
Explanation:
cos267° + cos223° = cos267° + cos2(90° – 67°)
= cos267° + sin267°
= 1
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Chapter 12: Trigonometric Ratios of Some Complemantary Angles - MULTIPLE-CHOICE QUESTIONS (MCQ) [Page 594]
