Bradford T. answered • 04/30/21

MS in Electrical Engineering with 40+ years as an Engineer

use sin(u+v) = sin(u)cos(v)+sin(v)cos(u)

Need cos(u) and sin(v) taking into consideration the signs depending on quadrants

cos(u) = -√(25-4)/5 = -√21/5

sin(v) = √(16-9)/4

Then just substitute values of the sines and cosines into the sine angle addition equation above.

David H.

what would be the correct final answer?04/30/21