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https://books.google.com/books?id=ZmR0MOQAu0UC&pg=PA250&dq=alexander graham bell struggled with math&hl=en&sa=X&ved=0CEUQ6AEwB2oVChMIq4z62sidyAIVg5mACh0I3gHe#v=onepage&q=mathematics&f=false