Answer
See graph.
Work Step by Step
To obtain the graph of $y=-2cos(2x-\pi)=-2cos[2(x-\frac{\pi}{2})]$, start from one period of $y=cos(x)$, shift horizontally $\frac{\pi}{2}$ to the right, shrink horizontally by a factor of $2$, stretch vertically by a factor of $2$, then reflect across the x-axis, repeat the resulting curve horizontally a few times to cover a wider region. See graph.
