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sec²a - cos²a = tan²a + sen²a
sec²a - (1-sen²a) = tan²a + sen²a
sec²a-1 + sen²a = tan²a + sen²a
tan²a + sen²a = tan²a + sen²a
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(1+tan²a)cos²a = 1
sec²a (cos²a) = 1
1 (cos²a) = 1
cos²a
1 = 1
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