improve latex parsing

app.py

@@ -169,7 +169,7 @@ def parse_latex_output(res):
         latex_buffer.append('$$')
         parsed_lines.extend(latex_buffer)
 
-    return '\n'.join(parsed_lines)
+    return '$$\\\\$$'.join(parsed_lines)
                          
 def ocr_demo(image, task, ocr_type, ocr_box, ocr_color):
     res, html_content, unique_id = process_image(image, task, ocr_type, ocr_box, ocr_color)