Problem $6.$ Let $x(t)=\frac{sin(2t)}{t}.$ Compute the energy of the following signals:

$x(t)\mathrm{.}2.\frac{dx(t)}{dt}3.\frac{d^{2}x(t)}{d{t}^2}$

$x(t)cos(10t).$

$\frac{dx(t)}{dt}cos(10t)$

$x(t)**x(t).$

Hint: Use Parseval's Formula.