Question

The angle between a pair of lines given by F = 3î +2} − 2k + 1⁄2 (î + 2 j +2k), r = 5î − 2} +1⁄21⁄2 (3î +2ĵ+6k) is

• A. cos-1($\frac{19}{21}$)
• B. sin-1($\frac{19}{21}$)
• C. cos-1($\frac{17}{21}$)
• D. tan-1($\frac{19}{21}$)

Answer 1

Answer: (A)

cos-1($\frac{19}{21}$)

Answer 2

The correct option is(A): cos-1($\frac{19}{21}$)