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Which one of the following is best condition for the plane ax + by + cz + d = 0 to intersect the x and y axes at equal angle |
|a| = |b| a = –b a = b a2 + b2 = 1 |
|a| = |b| |
The plane a x + b y + c z + d = 0 intersects x and y axes at equal angles Therefore |cos α| = |cos β| ⇒ |l| = |m| ⇒ |a| = |b| |
