Re: 問各微積分小問題
看板CSMATH作者vampirefish (driving my freedom)時間21年前 (2004/09/24 17:22)推噓1(1推 0噓 1→)留言2則, 1人參與討論串2/2 (看更多)
※ 引述《sweeten (不想要開學><)》之銘言:
: d/dx ln cosx= -tanx
d/dx ln a = 1/a
d/dx 1/cosx = -sinx/cosx = -tanx
using the chan rule(pro some spell error, but u know it, right?)
is that what u want?
it's seens too easy...............I am not sure
: d(tan- y/x)=(xdy-ydx)/(x平方+y平方)
it's a procial differnciation problem, right?
is that tan(-y/x)??
or other else..................well just let me know
: 有沒有人會證明勒 幫忙一下吧~~
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