Short · Engineering Exams
Identify the WRONG Cos 2A Formula! ❌🤯 #maths #shorts
3 November 2025
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Which of the following is the incorrect double angle identity for cos(2A)
(a) cos²A − sin²A
(b) 2cos²A − 1
(c) 1 − 2sin²A
(d) sin²A − cos²A
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