JEE Advanced 2023 Mathematics question
Let be the plane and let . Let , and be three distinct vectors in such that . Let be the volume of the parallelepiped determined by vectors , and . Then the value of is .
Answer: 45
Solution
The normal has length 4. Distance gives (30 is impossible for a unit vector), i.e. . So S is a circle on the unit sphere at height along , with radius
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