cos²37° + cos²53° =?
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Answer:
1
Explanation:
cos(90°- theta) = sin theta
cos (90-37) = sin 37
cos 53 = sin 37
cos²37° + cos²53° = cos²37° + sin²37°
cos²theta° + sin²theta° =1
Hence
cos²37° + sin²37° = 1
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