sin(2@ + 60)=0.3584
sin-1(0.3584)=21.000 degrees
21 is the correspondance angle
nd now using the grid .... u will see tht 180-21 & 360+21fit .
180-21= 159
360+21 = 381
ur criteria was 2@+60
therefore 2@+60=159 & 2@+60 = 381
solve these to eqns nd u will end up with the answers