Problem 2-2 Determine the magnitude of the resultant force FR = F1 - F2 and its orientation u x-axis 

This video explains in detail the solution to Problem 2-2 in the Chapter of Force Vectors from the book Engineering Mechanics: Statics by R.C. Hibbeler 15th Edition, where the magnitude of the resultant force and its orientation, measured counterclockwise from the positive x-axis is determined using Sine Law.
The solution to Problem 2-2 is available in PDF and can be obtained on request at solved.civil@gmail.com.
Reference: Chapter No. 2 Force Vectors, Engineering Mechanics Statics by R.C. Hibbeler 15th Edition.
For an explanation of any Problem, the request can be made at solved.civil@gmail.com.
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