Question

If $A-B=A\times B$ then angle between $A$ and $B$ is

• A. $45^{\circ }$
• B. $30^{\circ }$
• C. $60^{\circ }$
• D. $90^{\circ }$

Answer 1

Answer: (A)

$A\cdot B=A\times B$
$AB\cos \theta =AB\sin \theta$
$\tan \theta =1$
$\tan \theta =\tan 45^{\circ }$
$\theta =45^{\circ }$