Question

If A = B + C and the magnitudes of A, B and C are 5, 4 and 3 units, the angle between A and C is(a) cos⁻¹ (3/5) (b) cos⁻¹ (4/5)(c) $\frac{\pi}{2}$(d) sin⁻¹ (3/4)

Answer 1

Sorry I don't know the answer refer to others