Step |
Hyp |
Ref |
Expression |
1 |
|
ax-icn |
|
2 |
|
simpl |
|
3 |
|
mulcl |
|
4 |
1 2 3
|
sylancr |
|
5 |
4
|
recld |
|
6 |
5
|
reefcld |
|
7 |
|
simpr |
|
8 |
|
neghalfpirx |
|
9 |
|
halfpire |
|
10 |
9
|
rexri |
|
11 |
|
elioo2 |
|
12 |
8 10 11
|
mp2an |
|
13 |
7 12
|
sylib |
|
14 |
13
|
simp1d |
|
15 |
14
|
recoscld |
|
16 |
|
efgt0 |
|
17 |
5 16
|
syl |
|
18 |
|
cosq14gt0 |
|
19 |
18
|
adantl |
|
20 |
6 15 17 19
|
mulgt0d |
|
21 |
|
efeul |
|
22 |
4 21
|
syl |
|
23 |
22
|
fveq2d |
|
24 |
4
|
imcld |
|
25 |
24
|
recoscld |
|
26 |
25
|
recnd |
|
27 |
24
|
resincld |
|
28 |
27
|
recnd |
|
29 |
|
mulcl |
|
30 |
1 28 29
|
sylancr |
|
31 |
26 30
|
addcld |
|
32 |
6 31
|
remul2d |
|
33 |
25 27
|
crred |
|
34 |
|
imre |
|
35 |
4 34
|
syl |
|
36 |
1 1
|
mulneg1i |
|
37 |
|
ixi |
|
38 |
37
|
negeqi |
|
39 |
|
negneg1e1 |
|
40 |
36 38 39
|
3eqtri |
|
41 |
40
|
oveq1i |
|
42 |
|
negicn |
|
43 |
42
|
a1i |
|
44 |
1
|
a1i |
|
45 |
43 44 2
|
mulassd |
|
46 |
|
mulid2 |
|
47 |
46
|
adantr |
|
48 |
41 45 47
|
3eqtr3a |
|
49 |
48
|
fveq2d |
|
50 |
35 49
|
eqtrd |
|
51 |
50
|
fveq2d |
|
52 |
33 51
|
eqtrd |
|
53 |
52
|
oveq2d |
|
54 |
23 32 53
|
3eqtrd |
|
55 |
20 54
|
breqtrrd |
|