Question: How to solve trigonometric problem: 4 b . Four concurrent forces act at point C , as shown. The 1 5 kN force acts vertically

How to solve trigonometric problem:
4b. Four concurrent forces act at point C, as shown. The 15 kN force acts vertically while the 5 kN force acts along the hypothenuse of a triangle of 2 and 12 sides. Determine the magnitude of force F4 to keep the system in equilibrium (the sum of all acting forces equals cero).
How to solve trigonometric problem: 4 b . Four

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