" 12.If "|bar(a)+bar(b)|=|a" - "b|" prove that the angle between "bar(a)" and "bar(b)" is "90^(@)

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

If |bar(a).bar(b)|=3 and |bar(a)xx bar(b)|=4 then the angle between bar(a) and bar(b) is ………………

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

Three vectors bar(a),bar(b),bar(c) are such that bar(a)xxbar(b)=3(bar(a)xxbar(c)) .Also |bar(a)|=|bar(b)|=1,|bar(c)|=(1)/(3). If the angle between bar(b) and bar(c) is 60^(@), then

Three vectors bar(a),bar(b),bar(c) are such that bar(a)xxbar(b)=3(bar(a)xxbar(c))* Also |bar(a)|=|bar(b)|=1,|bar(c)|=(1)/(3). If the angle between bar(b) and bar(c) is 60^(@), then

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) is a perpendicular to bar(b) and bar(c), |bar(a)|=2, |bar(b)|=3, |bar(c)|=4 and the angle between bar(b) and bar(c) is (2pi)/(3) then |[bar(a) bar(b) bar(c)]| =

Let bar(a) and bar(b) be unit vector.If the vectors bar(c)=bar(a)+2bar(b) and bar(d)=5bar(a)-4bar(b) are perpendicular to the each other then angle between bar(a) and bar(b) is