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Wiki User
Draw a blank graph (x-y axis), then start plotting points until you find the straight-line (e.g. plot at least 2 points, then get a straight-edge and connect the dots):(x,y)(0,0)(1,-2)(2,-4)(-1,2)(-2,4)
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That line is [ y = 2 cos(2x) ].
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No.
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The domain of y = 2x is [0, +infinity].
Yes, that is a shifted tanX graph, just as you would shift any graft.