The sinusoid (adjective sinusoidal ) is a sinusoidal function derived from the sine function by scaling of amplitude and frequency and phase shifting is formed. It forms the basis of the representation in the frequency domain .
The sinusoid is defined by
the scaling of the amplitude ,
the scaling of the angular frequency
the phase shift and
the absolute term
is. In electrical engineering , the absolute term is the constant component over time .
Since one function of the form is also a sinusoid, the other trigonometric functions are not.