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.
2
0
2
=
2
x
2
-
2
x
2
c
o
s
1
3
0
d
e
g
r
e
e
s
Math Input
Natural Language
Math Input