? Exercise 1.6.3 For the parametric functions x = t³-t+3 and y = t2-3 determine the t-values where the graph crosses itself. t= (List your answers separated by commas.) ▼Hint From equations s3s+3=t3t+3 s2-3=t2-3 the second equation implies s = ±t. Plug s = -t into the first equation.

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