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July 31, 2014

July 31, 2014

Posted by **Robin** on Tuesday, June 18, 2013 at 10:39am.

- Calculus -
**Steve**, Tuesday, June 18, 2013 at 10:42amf(x) = x+4sin x

f'(x) = 1 + 4cos x

So, where is cos x = -1/4?

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