※ 引述《chen0404 (這個冬天會很暖)》之銘言：
: 求極限值lim[ 1-cos(x^2 + y^2) ]^(1/2) / x^2+y^2 =?
: (x,y)-->(0,0)
2 (1/2) (1/2)
(1-cos(r ) ) (1-cos s ) √2 *sin s/2 1
lim -------------- = lim ---------- = lim -------------- = ---
r->0 2 s->0 s s->0 2 s √2
r ----
: 算了好久...請高手幫一下唄!!謝謝... 2
希望沒錯
2
2 sin x = 1-cos 2x
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