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.
p
i
4
p
i
6
1
3
1
-
c
o
s
4
x
d
x
Math Input
Natural Language
Math Input
