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    Hi can someone please explain why the triangle is used. I understand how to get the integral I just don't get the steps after that please explain
    Thanks
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    (Original post by LittleBoxes)
    Attachment 727944
    Hi can someone please explain why the triangle is used. I understand how to get the integral I just don't get the steps after that please explain
    Thanks
    attachment not found, use imgur
 
 
 
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Updated: February 27, 2018
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