JEE Advanced Model Paper 13 with solutions for online practice

Question : 46 of 60

Marks: +1, -0

OABC is a tetrahedron with O = (0,0,0) , A = (1,2,1), B = (2,1,3) and C = (-1,1,2)then the angle between faces OAB and ABC is θ such that |35cosθ - 27| =