Amplitude of a Sinusoidal Function
In a sinusoidal function defined in its parametric form, which is [latex]f(x)=a·\sin (b(x-h))+k[/latex], the amplitude A of the function is provided by the absolute value of the parameter a : A = |a|.
Examples
In this graph, the function defined by f(x) = 2 sin(x) has an amplitude of 2.