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**Diessence** If anyone can help me solve this problem it would be greatly appreciated. I have been looking at it all day and cant for the life of me work out how to do it (it may not even be possible with only the variables I have)

I am trying to calcuate the angle 'Y'. I have labeled everything that I know. The only thing that isnt real clear is that I know what X' + X'' is, i dont know what they are individually.

I am pretty sure the answer is going to be pretty complicated. Feel free to ask any questions to anything that may not be clear.