The Fourier series of the square wave given by the following

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The Fourier series of the square wave given by the following figure where given a_k, b_k are nonzero, is

1. a₀ + a₁ cos ω₀ t + a₂ 2 cos ω₀ t + .....
2. b₁ sin ω₀ t + b₂ 2sin ω₀ t + b₃ + 2 sin ω₀ t + .....
3. a₁ cos ω₀ t + a₃ cos 3 ω₀ t + a₅ cos 5 ω₀ t +.....
4. b₁ sin ω₀ t + b₃ sin 3 ω₀ t + b₅ + sin 5 ω₀ t + .....

Correct Option: C

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