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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Nov 2007 19:55:51 IST
Accepted Answer [?]
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cosxcos(x+2) - cos^2(x+1)
= 1/2 (cos(2x+2) + cos 2) - cos^2(x+1)
= 1/2(2cos^2(x+1) - 1) + cos2/2 - cos^2(x+1)
= - (1-cos2)/2
= -sin^2(1)
so y=-sin^2(1)
its a straight line passing through (x, -sin^2(1)) parallel to x-axis
is it correct?
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