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MATLAB: Symbolic function problems

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Q: Write a function "xr = sreal(x)" which returns a symbolic expression representing the real (of "ireal(x)" for imaginary) part of x(t). (e.g. x(t) = exp(i*t) + exp(2*i*t)), any clues??

The real and imag functions don't return anything useful.

Having crazy problems with this :S

Any/All help well appreciated.
 

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