Which of the following functions have even-symmetrical waveforms, odd-symmetrical wave-\forms, or neither?\n(a) $x_1(t) = 3t^2$\n(b) $x_2(t) = \sin(2t)$\n(c) $x_3(t) = \sin^2(2t)$\n(d) $x_4(t) = 4e^{-t}$\n(e) $x_5(t) = |\cos(2t)|$
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