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The graph of one cycle of a sine curve with an amplitude of 4 and a period of -7 would look like a regular sine curve, except that it would be reflected over the y-axis due to the negative period.
The equation for the sine curve would be y = 4sin((2Ï€)/(-7)x), where a = 4, b = (2Ï€)/(-7) and 0 = 0.