Step |
Hyp |
Ref |
Expression |
1 |
|
ax-icn |
|
2 |
|
ine0 |
|
3 |
|
cxpef |
|
4 |
1 2 1 3
|
mp3an |
|
5 |
|
logi |
|
6 |
5
|
oveq2i |
|
7 |
|
halfpire |
|
8 |
7
|
recni |
|
9 |
1 1 8
|
mulassi |
|
10 |
|
ixi |
|
11 |
10
|
oveq1i |
|
12 |
6 9 11
|
3eqtr2i |
|
13 |
12
|
fveq2i |
|
14 |
4 13
|
eqtri |
|
15 |
|
neg1rr |
|
16 |
15 7
|
remulcli |
|
17 |
|
reefcl |
|
18 |
16 17
|
ax-mp |
|
19 |
14 18
|
eqeltri |
|