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January 25, 2015

January 25, 2015

Posted by **Robyn** on Friday, October 28, 2011 at 5:06pm.

y=Sin(x) / 2+ Cos (x)

- calculus -
**Steve**, Friday, October 28, 2011 at 5:53pmy' = cosx/2 - sinx

y'=0 where cosx = 2sinx

That is, where tanx = 1/2

So, if t = arctan(1/2) the tangent line is horizontal at

x = t + nπ

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