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Show that the straight lines whose direc...

Show that the straight lines whose direction cosines are given by the equations `a l+b m+c n=0a n dul^2+z m^2=v n^2+w n^2=0` are parallel or perpendicular as `(a^2)/u+(b^2)/v+(c^2)/w=0ora^2(v+w)+b^2(w+u)+c^2(u+v)=0.`

A

`a^(2)(v+w)+b^(2)(u+w)+c^(2)(u+v)=0`

B

`a^(2)(v-w)+b^(2)(u-w)+c^(2)(u-v)=0`

C

`u^(2)(b+c)+v^(2)(a+c)+w^(2)(b+a)=0`

D

None of these

Text Solution

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The correct Answer is:
A
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