a,b,cde,f?

2.6. For each of the signals given, determine mathematically if the signal is even, odd, or neither? (a) x(t)=2t (b) x(t)=e4t (c) x(t)=5cos6t (d) x(t)=u(t)u(t) (e) sin(6t2) (f) x(t)=u(t)+u(t)