I'm reading up on dot products and keep seeing two different examples.(adsbygoogle = window.adsbygoogle || []).push({});

One states thatu[itex]\cdot[/itex]v=u[itex]_{i}[/itex][itex]\cdot[/itex]v[itex]_{i}[/itex]+u[itex]_{j}[/itex][itex]\cdot[/itex]v[itex]_{j}[/itex]

Another:u[itex]\cdot[/itex]v= |u|[itex]\cdot[/itex]|v|cosθ

I'm not understanding when to use the first or second method?

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# Vector dot products

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