Straight line

Submitted by alpha on Sat, 10/31/2009 - 03:54.

Geometry questions

The graph of the function $y=y=cosx cos(x+2)-cos^2(x+1)$ is
a)A straight line passing through $(0,-sin^21)$ with slope 2
b)A straight line passing through (0,0)
c)A parabola with vertex $(1,-sin^21)$
d)A straight line passing through point $(\frac{\pi}{2},-sin^21)$ are parallel to the x-axis.

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Straight line