Question 732183
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http://m1342.photobucket.com/albumview/albums/dwaejitokki8/8371012C-F285-4ACE-8AB9-0D35EFEB9459-715-000000814C93031F_zps2f0ef32b.jpg.html?o=0&newest=1

I know the answer is 2 cot u , but I want to know how to get to it. Please explain to me. Thank you!
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