Posted by Margaret on .
The Fourier series expansion for the periodic function,f(t) = sin tis defined in its fundamental interval. Taking π = 3.142, calculate the Fourier cosine series approximation of f(t), up to the 6th harmonics when t = 1.09. Give your answer to 3 decimal places. Anybody can help?

math 
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TA E IT A. HALE. SO H S A ION