Energy and Power
x(t)= $ x^2\! $
Energy calculation
E= $ \int_{1}^{3}\ |x ^2|^2\, dx , \,\! $ E= $ \int_{1}^{3}\ x ^4\, dx , \,\! $ E= $ \frac{1}{5}\! $ {$ (3^5)\! $ - $ (1^5)\! $} E= $ \frac{1}{5}\! $*$ (243-1)\! $ E= $ 48.4\! $
