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Here: (e^2x + e^-2x )/2
= (2e^2x + 2e^-2x)/4
= (e^2x + 2 + e^-2x + e^2x 2 + e^-2x)/4
You finish it.
I am not sure either what you mean by "full form". Only thing that comes to my mind is Electroencephalogram, as Devante suggested. It can also stand for Electroencephalography.
Just use the definitions of the two that you provided.
For part c I'll give you a hint that;
sinh(2x) = 2sinh(x)cosh(x)
cosh(2x) = cosh^2(x) + sinh^2(x)
Again use the definition of cosh(x) and sinh(x) and manipulate the numbers to get their identities.
European currency has 20 cent coin as well as a 2 cent in addition to the ones you have listed. Since 2 is not in the list, I suggest its 25 cents.
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