I had some math problems that was troublesome, and I would like to know what are the steps to those problems. Here are the problems: 1)lim x->0 (tan5x/tan2x) the ans. is 5/2. 2) lim x->0 (1-cos(x))/sin(x). The ans. is 0. 3) lim x->0 (sec x-1)/(x sec(x)) the ans. is 0