|a vector + b vector|=|a vector - b vector| then the angle between a vector and b vector is what. Please explain

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Solution

Wherever magnitude of vector is given ,you should always square it.

(a+b)^2=(a-b)^2

2a.b=-2a.b

4a.b=0

a.b=0
the dot product of a.b is given as abcos(angle) here dot product is 0. Hence angle between a and b is 90°

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