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cot a = 1/tan = cos a/ sen a
cot a * tan a = 1/tan * tan a = 1
Identidad Fundamental:
sen² a+ cos² a = 1
1- sen ² a / sen a * cot a
= sen² a+ cos² a - sen ²a / sen a cot a
= cos²a / (sen a * cos a / sen a)
= cos²a/ cos a = cos a