单项选择题

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+......}