compare cos 65° e cos 85°
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cos65 = cos(150-85)
cos65 = cos150.cos85 + sen150.sen85
cos65 = -√3/2 . cos85 + 1/2 . sen85
2cos65 = -√3.cos85 + √(1-cos²85)
cos65 = cos150.cos85 + sen150.sen85
cos65 = -√3/2 . cos85 + 1/2 . sen85
2cos65 = -√3.cos85 + √(1-cos²85)
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