Express each force in Cartesian vector form and then determine the resultant force - 2-65

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2–65. Express each force in Cartesian vector form and then determine the resultant force. Find the magnitude and coordinate direction angles of the resultant force.
2–66. Determine the coordinate direction angles of F1.

Problem from Engineering Mechanics Statics, Fifteenth Edition.
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At 4:00 why did you take 45 and add it to 90

crafterz
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could you explain why we need to find it in the xy plane first? i cant visualize it

melissafigiel
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Thank you so much, please keep uploading videos

massoomaalrshim