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SCALCET$9$M $12\mathrm{.}3\mathrm{.}011.$

If $u$ is a unit vector, find $u*v$ and $u*w.($Assume $v$ and $w$ are also unit vectors.$)$

$u*v=$

$u*w=$

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SCALCET$9$M $12\mathrm{.}3\mathrm{.}017.$

Find the angle between the vectors. $($First find an exact expression and then approximate to the nearest degree.$)$

$a=($:$1,-4,1$:$),b=($:$0,2,-2$:$)$

exact

approximate

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