1) if in a triangle ABC <A = 60○,then $(1+\frac{a}{c}+\frac{b}{c} )(1+\frac{c}{b}-\frac{a}{b})$ equals ??
2. $(1 + \frac{a}{c} + \frac{b}{c})(1 + \frac{c}{b} - \frac{a}{b}) = \frac{( b + c + a)(b + c - a)}{bc} = \frac{(b + c)^2 - a^2}{bc}$