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For the $240$ KN force shown below, determine its components with respect to the following axis:

$($a$)x-y,$ where $x$ and $y$ are perpendicular

$($b$)x^{\text{'}}-y^{\text{'}}$ where $x^{\text{'}}$ and $y^{\text{'}}$ are perpendicular

$($c$)e-f$

Please explain how you get the answer to part c$)$