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Writethe direction cosines of a line parallel to z-axis.

Answer» let`(x-9)/C_1=(y-6)/C_2=(z-6)/C_3=t`
`x=a+c_1t=a`
`y=b+c_2t=b`
`c_1=0,c_2=0,c_3=k`
`sqrt(c_1^2+c_2^2+c_3^2=1`
`sqrt(0+0+k^2)=1`
k=1
the direction cosines of a line parallel to z-axis(0,0,1).


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