Question

what's the answer plz send it​

Answer 1

Answer:

as vector sum of p and q is underoot p^2 +q^2 +2pqcostheta and subtraction is underoot P^2 + q^2 -2pqcos theta

so the angle between p and q is 90 degree.

Answer 2

Explanation:

From the question we have ,

| P + Q | = | P - Q |

We know that the vectors written under mod gives magnitude

→ √ ( P^2 + Q^2 + 2PQ cos theta ) = √ ( P^2 + Q^2 - 2PQ cos theta )

Squaring on both sides

P^2 + Q^2 + 2PQ cos theta = P^2 + Q^2 - 2PQ cos theta

→ 4PQ cos theta = 0

→ cos theta = 0

→ Theta = 90 degree