Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
求 x^2 + y^2 = 25 在点 (3, 4) 处的切线。（答： 3x + 4y = 25 。）
求 x^2 + y^2 = 25 在点 (3, 4) 处的切线。（答： 3x + 4y = 25 。）
Natural Language
Math Input
Extended Keyboard
