DC component - Indication of expression of a line spectrum

Q.  What does the first term 'a0' in the below stated expression of a line spectrum indicate?

x(t) = a0 + a1 cos w0 t + a2 cos2 w0t +......+  b1 sin w0 t + b2 sin w0 t + .....
- Published on 30 Nov 15

a. DC component
b. Fundamental component
c. Second harmonic component
d. All of the above

ANSWER: DC component

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