The graph of the function y=cos xcos(x+2...

The graph of the function `y=cos xcos(x+2)-cos^2(x+1)` is:
(A)    A straight line passing through `(0,sin^2 1)` with slope 2
(B)    A stright line passing through `(0,0)`
(C)    A parabola with vertex `(1, -sin^2 1)`

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