Straight line

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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