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The amplitude and phase spectr a for the harmonics of a periodic signal of time period shown in the figure below, are

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cos 
2πt - π 
+ 0.75 cos 
6πt + π 
+ 0.1 cos 
10πt + π 
............... 4 2 6 -
cos 
t - π 
+ 0.75 cos 
t + π 
+ 0.1 cos 
t + π 
............... 2π 4 6π 2 10π 6 -
cos 
2πt - π 
+ 0.75 cos 
6πt + π 
+ 0.1 cos 
10πt + π . 1 
............... 4 2 6 6 -
- cos 
2πt - π 
+ 0.75 cos 
6πt + π 
+ 0.1 cos 
10πt + π 
............... 4 2 6
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Correct Option: A
NA