If you've been watching, you should be able to solve this one!

Solutions on the web
https://artofproblemsolving.co....m/wiki/index.php/198
https://web2.0calc.com/questio....ns/another-one-of-my
http://jwilson.coe.uga.edu/MAT....H7200/ProblemSet4.3. https://www.youtube.com/user/M....indYourDecisions?sub

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