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1 / sec x = cos x
1 + tan x / sec x = 1 + (sen x / cos x) cos x
1 + tan x / sec x = 1 + sen x
por otra parte
cot x = cos x / sen x
1/ csc x = sen x
1 + cot x / csc x = 1 +(cos x / sen x) sen x
1 + cot x / csc x = 1 + cos x
No es una identidad