Question: Error Plotting a Parametric Equation

So I've been trying to plot a parametric equation with the command:

But I keep recieving the error: Error, (in plot) incorrect first argument [cos(2*t)+sin(2*t), -2*sin(2*t)+2*cos(2*t), t = 0 .. 6.29]

Do any of you have an idea of what I'm doing wrong?

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