Show that (Aetkx + Be-ikx)and (C cos kx + D sin kx) are equivalent ways of writing the same function of x, and determine the constants C and D in terms of A and B and vice versa?

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A: Open the mod. I have shaded the interval.  

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A: As per bartleby guidelines we only give first question answers. 

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A: The solution is given below.

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