The origin lies in the acute angle between the planes $ax + by + cz + d = 0$ and $a'x + b'y + c'z + d' = 0$ if $aa' + bb' + cc' < 0$ and:
- A$d$ and $d'$ have the same sign
- B$d$ and $d'$ have opposite signs
- C$aa' + bb' + cc' > 0$
- DNone of these
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