Find the energy of the following CT signal. 

(a) \(x(t)=\operatorname{tri3} t\); 

(b) \(x(t)=2 \operatorname{tri}\left(\frac{t}{2}ight)\);
(c) \(x(t)=\operatorname{rect10t}\); 

(d) \(2 \operatorname{rect}\left(\frac{t}{10}ight)\); 

(e) \(\sin (2 \pi t)\).