Posted by Rick on Thursday, February 28, 2008 at 1:43pm.
You probably meant to write
y = cos x cos pi over6 + sin x sin pi/6 which is
y = cos(x - pi/6)
first sketch very faintly, perhaps as a dotted line, the function y = cosx from 0 to 2pi
then move this graph pi/6 units to the right.
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