Question

angle between (vector a +vector b)and (vector a- vector b)​

Answer 1

Answer:

The angle between vectors a and b if a.b=a×b:

Substitute in the given equation we get AB Sin(x) = AB Cos(x),

Now Sin(x)= Cos(x).

Finally we get Tan(x)= 1.

Since the magnitude of a.b and a×b are equal,

abcosθ=absinθ,

cosθ=sinθ,

tanθ=1 and θ=45°, 225.

That is x= 45° so your answer will be 1.