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September 21, 2014

September 21, 2014

Posted by **Anonymous** on Sunday, September 23, 2012 at 2:19am.

f(x) = sin 2x − 2 sin x

at which the tangent line is horizontal. (Enter your answers as a comma-separated list. Use n to represent any integer.)

- calculus -
**Steve**, Sunday, September 23, 2012 at 7:43amtangent is horizontal when f'(x) = 0

f'(x) = 2cos2x - 2cosx

f'(x) = 0 when x = 2k*pi or 2k*pi +/- 2pi/3

for all integers k

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