Answer
(a) $a$
(b) $\sin\theta$
Work Step by Step
(a) $\frac{a/b}{1/b}$ = ${\frac{a}{b}}\times{\frac{b}{1}}$ = $\frac{a}{1}$ = $a$
(b) $\frac{\sin\theta/\cos\theta}{1/\cos\theta}$ = ${\frac{\sin\theta}{\cos\theta}}\times{\frac{\cos\theta}{1}}$
= $\sin\theta$
