Question

a+b = a - b prove that the angle between a and b is 90°.​

Answer 1

Answer:

|a+b|²=|a-b|²

(a+ b)(a+b) = ( a -b)(a-b)

a²+b²+2ab=a²b²-2ab

2ab+2ab=0

4ab=0

ab=0

|a||b|cos tita =0

cos tita=0

tita =90°

I hope brainest this answer