Plots to Equations

What is the equation for this plot? Hint

Click here for the answer \(15 \cos(2 \pi 1000t) \) \(A = 15\) \(f = 1000\) Hz \(\phi = 0\)

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What is the equation for this plot? Write in the form \(x(t) = A \cos(2\pi f_0 t + \phi) \)
Click the plot for a hint

Click here for the answer \(10 \cos(2 \pi 1000t + \pi/2) \) \(A = 10\) \(f = 1000\) Hz \(\phi =\pi/2\) radians