Solution of task 1.1.5 from the collection of Kepe OE

Solution of task 1.1.5 from the collection of Kepe OE

1.1.5
Which modulo force F3 must be applied to the convergent forces F1 = 2H and F2 = 4H,
Forming angles with the Ox axis:? = 30 °,? = 60 °, so that the resultant of these three forces
Was equal to zero? (Report 6,62)