For symmetrical waveform average value of one full cycle is 

The correct answer is option 4):0

Concept:

• In the case of symmetrical waves like sinusoidal voltage or current, the average value over one cycle is zero.
• It is because the positive half-cycle is exactly equal to the negative half-cycle.For example symmetrical sine waveform 

• The average value of any waveform is nothing area under a waveform over the given time period. If we consider the full cycle, the area under the positive cycle is equal to the area under the negative cycle and the area under the complete cycle is equal to zero. Hence, the average value of a sinusoid for a complete cycle is zero.