Problem

Problem

The graph of the function y=cos⁡xcos⁡(x+2)−cos⁡2(x+1)y = \cos x \cos(x+2) - \cos^2(x+1) is (a) a straight line passing through (0,−sin⁡21)(0, -\sin^2 1) with slope 2 (b) a straight line passing through (0,0)(0, 0) (c) a parabola with vertex (1,−sin⁡21)(1, -\sin^2 1) (d) a straight line passing through the point (π2,−sin⁡21)\left(\frac{\pi}{2}, -\sin^2 1\right) and parallel to the x-axis

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