Three ranges, three endpoint decisions

Find the range of each of the following functions.

(a) $f:x\mapsto x^2+4x+3$, $x\in\mathbb R$, $x\leq-2$.

(b) $g:x\mapsto e^{2x}$, $x\in\mathbb R$, $x>0$.

(c) $h:x\mapsto\sin x$, $x\in\mathbb R$, $-\pi\leq x\leq\pi$.