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y= Secx = 1/cos x
y'= (Sec x)' = (1/cosx)'
Por derivada de un cociente:
y'= (Sec x)' = -1*(-senx) / cos²x
y'= (Sec x)' = senx / cos²x
Senx /Cosx = Tan x
y'= (Sec x)' = Tanx * 1/cosx
Como Sec x = 1/cos x, entonces:
y'= (Sec x)' = Tanx Secx