need help for this system and signal question

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moonnightingale

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I have attached the question
kindly tell me how to start it
 

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Do I get credit for doing your homework? Hint: Euler's formula.
 

I am lost for last 4 hours
yes i know euler identity is going to be used
i have solved 10 other questions which were in the form of cosine and sine
but i am stuck with this one

kindly help me
 

I think I must be missing something, but what that signal looks like to me is a composite of 20 signals (first through 10th harmonic) (K=-10 to +10) Maybe the answer is 3? (All the other frequencies are harmonics of that)

K=1=> w=6*pi*f=2*pi*3
 

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