Where defined, (sec x)^4 - (tan x)^4 = (sec x)^2 + (tan x)^2. True or False?

Its True.


1) (sec x)^4 - (tan x)^4


x1=0 ; x2=0 ; x3=0 ; x4=0





2) (sec x)^2 + (tan x)^2


x1=0 ; x2=0





you see they have same result . Equation is True.Where defined, (sec x)^4 - (tan x)^4 = (sec x)^2 + (tan x)^2. True or False?
this might be useful to you.





http://www.halexandria.org/dward123.htm





my assumption would be falseWhere defined, (sec x)^4 - (tan x)^4 = (sec x)^2 + (tan x)^2. True or False?
what do you think?