How do you graph #y=1-sinx# over the interval #0<=x<=360#?
This demonstrates the equality
The sine function is cyclic, and will move between 0 and +/-1 in one full cycle. Translating it by one unit makes it the same as a cosine function.
In this case, it will start at 1 instead of 0, decrease through 0 to -1 and then return through 0 to +1 again.