單項選擇題

按傅里葉變換理論,周期信號可以展開為一組正交的正弦信號和余弦信號,對下圖所示的50Hz的方波信號,請問哪個展開式是對的?()

A.0.5*(12/π)*{sin(2π50t)+sin(2π150t)/3+sin(2π250t)/5+sin(2π350t)/7+......}+0.5*(12/π)*{cos(2π50t)+cos(2π150t)/3+cos(2π250t)/5+cos(2π350t)/7+......}
B.(12/π)*{sin(2π50t)+sin(2π150t)/3+sin(2π250t)/5+sin(2π350t)/7+......}
C.(12/π)*{sin(2π50t)+sin(2π150t)/3+sin(2π250t)/5+sin(2π350t)/7+......}+(12/π)*{cos(2π50t)+cos(2π150t)/3+cos(2π250t)/5+cos(2π350t)/7+......}
D.(12/π)*{cos(2π50t)+cos(2π150t)/3+cos(2π250t)/5+cos(2π350t)/7+......}


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