關於sin a除a,拎a做一個好細既數.

(sin 10^-97.25)/10^-97.25 doesn't equal to 0. It would just be a extremely tiny vaule which your calculator can't display. I assume you have used a calculator to evaluate those questions, right?

hope this can help =]

實際上，當a趨近於0時，(sin a)/a趨近於1
計數機涉及極大或極小的計算時，結果不一定可靠。