|a vector + b vector|=|a vector - b vector| then the angle between a vector and b vector is what. Please explain
If A vector = Axi, B vector = Byj, C vector = A vector + B vector and D vector = A vector × B vector, then C vector • D vector is equal to what
If | vector A -vec B| = |vec A| = | vecB| , the angle between vector A and vector B is