Orthogonal Basis Functions in the Fourier Transform

Explains how the Fourier Transform equation is in fact a projection of the time domain signal onto a set of orthogonal basis functions (the complex sinusoids).
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* Note that in the final expression, I really should have put an extra set of brackets around the argument of each of the two cos functions. ie. inside the final integral it should be 1/2 cos((ω1 + ωb) t) + 1/2 cos((ω1 - ωb) t)

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