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1 - sen²x
------------- = Cos⁴x (1- sen²x = cos²x por identidad fundamental)
sec²x
cos²x
--------- = cos⁴x
sec²x
cos²x * 1
------- = cos⁴x Pero cos²x = 1/sec²x
sec²x
cos²x * cos²x = cos⁴x
cos⁴x = cos⁴x