trig
posted by Rick .
Graph one complete cycle of
y + cos x cos pi over6 + sin x sin pi/6 by first rewriting the right side in the form cos(AB)

trig 
Reiny
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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