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9-69.

Convert the following sets of parametric equations into rectangular form (in terms of $x$ and $y$).

1. $x = \cos(t) \text{ and } y = \sin(t)$

2. $x = \cos(2t) \text{ and } y = \sin(2t)$

3. $x = t^4 - 3t^2 \text{ and } y = t^2$

$\sin^2(x) + \cos^2(x) = 1$