ESE 2021 Technical Quiz || Fourier Series

For a signal u(sint); Fourier series is having

The Fourier series expansion of a real periodic signal with fundamental frequency f₀ is given by f(t) = if it is given that c₃ = 2 + j5 then c_-3 is

A signal x(t) is defined as x(t) = 50 cos 314t. Find the magnitude of the second harmonic present in the Fourier series expansion of the signal x(t).

The Fourier series coefficient of a periodic signal, x(t) is defined as

Which of the following statement is correct.