Question

If A vector × B vector is equal to B vector × A vector then find the angle between Avector and Bvector​..

Answer 1

A × B =B× A

according to farmula,,

(a+b)² =a²+ b²+ 2ab

(A×B)²= À²+B²+ 2A×B

(B×A)= B²+À²+2B× A

ABcosQ= Q = 1⁰

BAcos= Q=1⁰

take under root ,,

{ A+B}={B-A}

take under root ..

A²+B² +2ABcosQ =B²+A²-2BA

under root cancel each others

A²+B² +2ABcosQ = B²+A²-2BA

see the attachment