Question

5. If (À +B). (A-B) = 0, show that the magnitude
both the vectors are equal.​

Answer 1

Answer:

Answer

We have ∣a.b∣=∣a×b∣

⇒∣a∣∣b∣∣cosθ∣=∣a∣∣b∣∣sinθ∣

( where θ is the angle between a and b)

⇒∣cosθ∣=∣sinθ∣⇒θ=

4

π

or

4

3π

But a.b<0,∴θ=

4

3π