1.

Thevalue(S) of alpha in [0,2pi] forwhichvectorvec(a)= hat(i) + 3hat(j) + (sin 2 alpha) hat(k)makes an obtuse angle with the z-axis and thevectors vec(b) = (tan alpha)hat(i) - hat(j) + 2 sqrt(sin(alpha)/(2))hat(k) andvec(c) = (tan alpha)hat(i) (tan alpha)hat(j)- 3 sqrt(cosec(alpha)/(2))hat(k) are

Answer»

`TAN^(-1) 3`
`PI - tan^(-1) 2`
`pi + tan^(-1)3`
`2PI - tan^(-1) 2`

ANSWER :B::D


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