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One states that

**u**[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?