Express each force in Cartesian form and find the resultant force

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The bracket is subjected to the two forces shown.
Express each force in Cartesian vector form and then
determine the resultant force FR. Find the magnitude and
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WHY THE F1(x) IS F1(xy).SIN25 ? CAN YOU EXPLAIN FOR ME PLEASE ?

ducvungoc
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For the life of me I could not understand the projection but thanks to your video it helped.

CluckYou
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Anyone know why that line is F1(x, y)?

FinacialHub
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can anyone find a video where the guy actually explains what he's doing

jacobpowell
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How do I know when to use sine or cosine to find z?

jacobhanni
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why did we used cosine inverse to find the angle? can u explain please

ysbm
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The video sound is pretty good, beyond my imagination

trungvu