3. The values of a period 2x function f(t) in one full period are given. Sketch several periods of its graph and find its Fourier series. ≤t<0; 0≤t≤n Sketch several periods of its graph. Choose the correct graph below. f(t) = O A. 4x + 4t 0 4f(t) - 4x B. Q 4 f(t) 4x OC. Q 4Af(t) 5 - 4x 12x D. Q Q 4xAf(t) - 4x 12x Find its Fourier series. f(t)- (Type a series using n as the index variable and 1 as the starting index. Type an exact answer, using as needed. Use parentheses to denote the summand. Use parentheses to clearly denote the argument of each function.)

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