Question

If |→a|=10,|→b|=15 and the angle between the vector →aand→bis45∘, then find →a.→b.

Answer 1

Answer:

1. 150\√2

Step-by-step explanation:

→a.→b=I→aI I→bI cosФ

         =(10)(15) cos 45°

         =(150)( 1/√2)

        =150/√2