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MHT CET20227 Aug 2022Evening ShiftMathematicsThree Dimensional GeometryActual

The angle between the lines r =( i +2 j +3 k )+ (2 i -2 i + k ) . and r =( i +2 j +3 k )+ (2 i +2 i + k ) i +2 j+k

Options

  1. A90^
  2. B0^
  3. C30^
  4. D60^

Correct answer

A. 90^

Step-by-step solution

= ⁻¹ ( 2 1-2 2+1 2 2^2+2^2+1^2 1^2+2^2+2^2 )= ⁻¹(0)=90^

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