Sinusoids

1.

What are the amplitude, frequency, and phase of the sinusoid $x(t)=A\cos(2\pi ft+\phi)$ in the diagram below.

Amplitude (A)	Frequency (f)	Phase ($\phi$)

2.

What are the amplitude, frequency, and phase of the sinusoid $x(t)=A\cos(2\pi ft+\phi)$ in the diagram below.

Amplitude (A)	Frequency (f)	Phase ($\phi$)

3.

Plot a the signal $x(t)=2\cos(2\pi 4t - \frac{\pi}{2})$ in the diagram below.