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y=tanx = senx /cosx
Por derivada de un cociente:
y'=(tanx)' = (senx)' cosx - senx (cosx)' / (cosx)²
y'=(tanx)' = cosx cosx - (senx (-senx)) / cos²x
y'=(tanx)' = cos²x + sen² x/ cos²x
cos²x + sen² x = 1
y'=(tanx)' = 1/cos²x
y'=(tanx)' = sec²x