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IEEEs, HW help please with complex frequencies??

T

Techie333

Platinum Member
I don't understand how to get complex frequencies from real time functions.
For example, in an example they ask to identify all the complex frequencies in the following fuctions:
a) 2e^(-100t)+e^(-200t)sin2000t. The answer is -100+j2000, -100-j2000, -200+j2000, -200-j200.

b) (e^(-10t))cos10tsin40t. The answer is: -10+j30, -10-j30, -10+j50, -10-j50

How do they get these!??!
 
damn its been a long time but for a start did you try breaking the sin and cos into their exponentials like sin x = e^jwt + e^-jwt ( yeah thats probably wrong ) but then expanding that out? after that i have no idea
 
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