Show that the straight lines whose direction cosines are given by the equations al + bm + cn = 0 and ul² + vm² + wn² = 0 are parallel or perpendicular as a² b² c² +-+ V 21 W = 0 or a (v + w) + b²(w+u) + c²(u + v) = 0.

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A: dxdy=xy+1-xy-1xy+1+xy-1      =xy+1-xy-1xy+1-xy-1xy+1+xy-1xy+1-xy-1      =xy+1-2xy2-1+xy-1xy+1-xy+1…

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A: Note: As per your requirement I answered here on papar.   The required answer is in below step.

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