Problem Given the Fourier equation: $$f(t) = 5 \cos (20\pi t) + 2 \cos (40\pi t + \cos (80\pi t)$$ What is the fundamental frequency? A. 10 C. 40 B. 20 D. 30 Read more about Fundamental Frequency of Fourier Equation in Cosine FormLog in or register to post comments