Further MathematicsTrigonometryWAEC
Express cos 2A in terms of sin A.
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Answer: D. 1 − 2sin²A
cos 2A = cos²A − sin²A = 1 − 2sin²A.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.
Further Mathematics · Trigonometry
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