My book says this:(adsbygoogle = window.adsbygoogle || []).push({});

I don't understand how this works. I learned that the usual sunisoidal function looks like

sin(wt+phi), where w is frequency, t is time, and phi is some offset.

EQ 17.1 doesn't match the bolded formula above. How does this work?

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# A Periodic Function Looks Like This Formula?

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