Question

if abar and bbar are equal vector such that |a bar cross b bar|= a bar* b bar the |a bar + b bar|^2 is

Answer 1

Answer:

Given

A

×

B

=

B

×

A

⇒

A

×

B

−

B

×

A

=0

⇒

A

×

B

+

A

×

B

=0

⇒2(

A

×

B

)=0

⇒2

∣

∣

∣

∣

A

∣

∣

∣

∣

∣

∣

∣

∣

B

∣

∣

∣

∣

sinθ=0

∴sinθ=0

Hence, θ=π