1.

Let a vector bar(r) make angle 60^(@), 30^(@) with x and y-axes respectively. What are the direction cosines of bar(r) ?

Answer»

`(:1/2,(SQRT(3))/(2),0:)`
`(:1/2,(sqrt(3))/(2),0:)`
`(:(1)/(sqrt(2)),(1)/(sqrt(2)),0:)`
`(:-(1)/(2),(sqrt(3))/(2),0:)`

Solution :`r = lt 1, m, n gt , r = lt cos 60^(@), cos 30^(@), cos90^(@) gt`
Direction cosines of `vec(r)= lt (1)/(2) , (sqrt(3))/(2) , 0 lt`


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