Question: A signal x ( t ) is given by x ( t ) = 4 cos ( 8 0 0 t / 4 ) and

A signal x(t) is given by x(t)=4cos(800t/4) and its spectrum has the form
What is the value of f1? Note that the frequency axis is given in units of Hertz.
Group of answer choices
800
800
400
400

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