This document discusses how to write sinusoidal functions from graphs by determining the parameters a, b, c, and d, where a is the amplitude, b is the frequency, c is the phase shift, and d is the vertical shift. These parameters can be estimated from graphs of sinusoidal functions and used to write the function in the form y = a sin b(x + c) + d.

1. Sinusoidal Equations
1. Determine approximate values for the parameters 'a', 'b', 'c', and 'd' from the
graphs, and then write the equations of each graph as a sinusoidal function in the
form: y = a sin b(x + c) + d