3-d

Question: The value of $aa'+\,bb'+\,cc'$ being negative the origin will lie in the acute angle between the planes $an+by+cz+d=0$ and $a'x+b'y+c'z+d'=0$ , if



1) $a=a'=0$
2) d and $d'$ are of same sign
3) d and $d'$ are of opposite sign
4) None of these
Solution: Explanation: No Explanation
Plane

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