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If vecP=3hati+4hatj+12hatk then find mag...

If `vecP=3hati+4hatj+12hatk` then find magnitude and the direction cosines of the `vecP`.

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magnitude `vecP` is `=sqrt(P_(x)^(2)+P_(y)^(2)+P_(z)^(2))=sqrt(3^(2)+4^(2)+12^(2))=sqrt(169)=13`
(ii) `cos alpha =(P_(x))/(P)=(3)/(13), cos beta=(P_(y))/(P)=(4)/(13), cos lambda=(P_(z))/(P)=(12)/(13)`
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