Posted by **Kay** on Friday, December 31, 2010 at 10:31pm.

Determine the frequency of y = 2 �� 3 cos 10x. (nearest tenth)

Please help!

- Trig -
**bobpursley**, Friday, December 31, 2010 at 10:48pm
I cannot determine your function, and in fact, I do not see time as a variable.

- Trig -
**Marth**, Saturday, January 1, 2011 at 8:34pm
For y = sin(wx) or y = cos(wx), w = 2pi*f (where f is frequency). So f = w/(2pi).

For y = 3cos(10x), f = 10/(2pi) = 5/pi.

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