Question: Please help with the following calculus question: Problem 3. Show that equation r + 2r + cosr = 0 has EXACTLY one real root. (

Please help with the following calculus question:

Please help with the following calculus question: Problem 3. Show that equation

Problem 3. Show that equation r + 2r + cosr = 0 has EXACTLY one real root. ( You must state the name(s) of the theorem(s) you are using.)

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