Simplify this into 1 trigonometry function:
(sec(x)-cos(x))/sin(x)
hint: the answer is tan(x) but how do you get this?

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%