If `|bar a+bar b| < |bar a-bar b|` then `(bar a,bar b)` is

If |bar(a).bar(b)| = |bar(a) xx bar(b)| & bar(a). bar(b) lt 0 , then find the angle between bar(a) and bar(b) .

If |bar(a)+bar(b)| = |bar(a)-bar(b)| then find the angle between bar(a) and bar(b) .

(d) answer ANY one question :1. bar a, bar b and bar c be three vectors such that bar a +bar b+ bar c =0 and |bar a|=1, |bar b|=4,|bar c |=2 . Evlautae bar a.bar b + bar b.bar c+bar c.bar a .

IF bar a , bar b , bar c are mutually perpendicular vectors having magnitudes 1,2,3 respectively then [ bar a + bar b + bar c " " bar b - bar a " " bar c ]=?

If |bar(a)+bar(b)|=|bar(a)-bar(b)| , then the vectors bar(a) and bar(b) are orthogonal.

If bar(a), bar(b), bar(c) form a left handed orthogonal system and bar(a)*bar(a)=4, bar(b)*bar(b)=9, bar(c)*bar(c)=16 then [bar(a) bar(b) bar(c)] =

If |bar(a)+bar(b)|=1 , |bar(a)-bar(b)|=7 , |bar(a)|=4 then |bar(b)|

If bar(a) and bar(b) be non collinear vectors such that |bar(a)times bar(b)|=bar(a).bar(b) then the angle between bar(a) and bar(b) is