A function $f (x, y)$ is homogeneous of degree $n$ if which relation is satisfied for all non-zero real scalars $t$ ?

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If $l, m, n$ are the direction cosines of a straight line in three-dimensional space, what is the value of $l^{2} + m^{2} + n^{2}$ ?
Which formula gives the shortest distance $d$ between two skew lines $r = a_{1} + λ b_{1}$ and…
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