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The expression is 3|t - y|.
x2 is the same as x times x. In this case x = t+2 so we can say (t+2)2 is (t+2)(t+2) or t2+4t+4
5t - 1 = -11 Therefore, 5t = -10 t = -10/5 t = -2
It normally means 2 times t which can also be expressed as 2t
z=e^(2 times pi times i times t) If t goes from 0 to 1, then you get the unit circle.