A force F has magnitude 15N. Direction of F is 37 degrees from negative x axis towards positive y axis. Represent F in terms of i^ and j^.
9i^+12j^
-12i^+9j^
-15i^
-9i^+12j^
Fx= 15cos (180-37) = -12 Fy= 15sin(180-37)= 9 Hence, F= -12i^+9j^