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April 18, 2015

April 18, 2015

Posted by **Grace** on Monday, January 16, 2012 at 8:39pm.

- Precalc -
**Steve**, Tuesday, January 17, 2012 at 2:17pma.b = |a|*|b|*cosθ

= 3 * 1 * (-.3) = -.9

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