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