Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of moments of all the forces about any point should be zero
Algebraic sum of the vertical components of all the forces should be zero
All of these

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The sum of the resolved parts of the forces in the given direction
The algebraic sum of the resolved parts of the forces in the given direction
The sum of the forces multiplied by the sine of θ
The difference of the forces multiplied by the cosine of θ

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