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.
limit as x -> 0 of (cos(a+x) - cos a)/x . (Resp.: -sin a .)
limit as x -> 0 of (cos(a+x) - cos a)/x . (Resp.: -sin a .)
Natural Language
Math Input
Extended Keyboard
