Proof of Theorem sinperlem2
| Step | Hyp | Ref
| Expression |
| 1 | | elznn0 6151 |
. . . . 5
⊢ (K ∈ ℤ ↔ (K
∈ ℝ ⋀ (K ∈ ℕ0
⋁ -K
∈ ℕ0))) |
| 2 | 1 | pm3.27bi 326 |
. . . 4
⊢ (K ∈ ℤ → (K
∈ ℕ0 ⋁
-K ∈
ℕ0)) |
| 3 | | sinperlem1 8681 |
. . . . 5
⊢ (K ∈ ℕ0 → ((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) =
0)) |
| 4 | | sinperlem1 8681 |
. . . . 5
⊢ (-K ∈ ℕ0 → ((cos ‘(-K · (2 · π))) = 1 ⋀ (sin ‘(-K · (2 · π))) =
0)) |
| 5 | 3, 4 | orim12i 336 |
. . . 4
⊢ ((K ∈ ℕ0 ⋁
-K ∈
ℕ0) → (((cos
‘(K · (2 ·
π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0) ⋁ ((cos ‘(-K · (2 · π))) = 1 ⋀ (sin ‘(-K · (2 · π))) =
0))) |
| 6 | 2, 5 | syl 10 |
. . 3
⊢ (K ∈ ℤ → (((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0) ⋁ ((cos ‘(-K · (2 · π))) = 1 ⋀ (sin ‘(-K · (2 · π))) =
0))) |
| 7 | | mulneg1t 5463 |
. . . . . . . . 9
⊢ ((K ∈ ℂ ⋀ (2 ·
π) ∈ ℂ) → (-K
· (2 · π)) = -(K
· (2 · π))) |
| 8 | | zcnt 6142 |
. . . . . . . . 9
⊢ (K ∈ ℤ → K
∈ ℂ) |
| 9 | | 2cn 5982 |
. . . . . . . . . . 11
⊢ 2 ∈ ℂ |
| 10 | | pire 8672 |
. . . . . . . . . . . 12
⊢ π ∈ ℝ |
| 11 | 10 | recn 5326 |
. . . . . . . . . . 11
⊢ π ∈ ℂ |
| 12 | 9, 11 | mulcl 5333 |
. . . . . . . . . 10
⊢ (2 · π)
∈ ℂ |
| 13 | 12 | a1i 8 |
. . . . . . . . 9
⊢ (K ∈ ℤ → (2 · π) ∈ ℂ) |
| 14 | 7, 8, 13 | sylanc 473 |
. . . . . . . 8
⊢ (K ∈ ℤ → (-K
· (2 · π)) = -(K
· (2 · π))) |
| 15 | 14 | fveq2d 3734 |
. . . . . . 7
⊢ (K ∈ ℤ → (cos ‘(-K · (2 · π))) = (cos
‘-(K · (2 ·
π)))) |
| 16 | 15 | eqeq1d 1486 |
. . . . . 6
⊢ (K ∈ ℤ → ((cos ‘(-K · (2 · π))) = 1 ↔
(cos ‘-(K · (2 ·
π))) = 1)) |
| 17 | | axmulcl 5285 |
. . . . . . . . 9
⊢ ((K ∈ ℂ ⋀ (2 ·
π) ∈ ℂ) → (K
· (2 · π)) ∈ ℂ) |
| 18 | 17, 8, 13 | sylanc 473 |
. . . . . . . 8
⊢ (K ∈ ℤ → (K
· (2 · π)) ∈ ℂ) |
| 19 | | cosnegt 7443 |
. . . . . . . 8
⊢ ((K · (2 · π)) ∈ ℂ → (cos
‘-(K · (2 ·
π))) = (cos ‘(K · (2
· π)))) |
| 20 | 18, 19 | syl 10 |
. . . . . . 7
⊢ (K ∈ ℤ → (cos ‘-(K · (2 · π))) = (cos
‘(K · (2 ·
π)))) |
| 21 | 20 | eqeq1d 1486 |
. . . . . 6
⊢ (K ∈ ℤ → ((cos ‘-(K · (2 · π))) = 1 ↔
(cos ‘(K · (2 ·
π))) = 1)) |
| 22 | 16, 21 | bitr2d 531 |
. . . . 5
⊢ (K ∈ ℤ → ((cos ‘(K · (2 · π))) = 1 ↔
(cos ‘(-K · (2 ·
π))) = 1)) |
| 23 | | sinnegt 7442 |
. . . . . . . 8
⊢ ((K · (2 · π)) ∈ ℂ → (sin
‘-(K · (2 ·
π))) = -(sin ‘(K ·
(2 · π)))) |
| 24 | 18, 23 | syl 10 |
. . . . . . 7
⊢ (K ∈ ℤ → (sin ‘-(K · (2 · π))) = -(sin
‘(K · (2 ·
π)))) |
| 25 | 24 | eqeq1d 1486 |
. . . . . 6
⊢ (K ∈ ℤ → ((sin ‘-(K · (2 · π))) = 0 ↔
-(sin ‘(K · (2 ·
π))) = 0)) |
| 26 | 14 | fveq2d 3734 |
. . . . . . 7
⊢ (K ∈ ℤ → (sin ‘(-K · (2 · π))) = (sin
‘-(K · (2 ·
π)))) |
| 27 | 26 | eqeq1d 1486 |
. . . . . 6
⊢ (K ∈ ℤ → ((sin ‘(-K · (2 · π))) = 0 ↔
(sin ‘-(K · (2 ·
π))) = 0)) |
| 28 | | sinclt 7431 |
. . . . . . 7
⊢ ((K · (2 · π)) ∈ ℂ → (sin
‘(K · (2 ·
π))) ∈ ℂ) |
| 29 | | negeq0t 5808 |
. . . . . . 7
⊢ ((sin ‘(K · (2 · π))) ∈ ℂ → ((sin
‘(K · (2 ·
π))) = 0 ↔ -(sin ‘(K
· (2 · π))) = 0)) |
| 30 | 18, 28, 29 | 3syl 20 |
. . . . . 6
⊢ (K ∈ ℤ → ((sin ‘(K · (2 · π))) = 0 ↔
-(sin ‘(K · (2 ·
π))) = 0)) |
| 31 | 25, 27, 30 | 3bitr4rd 553 |
. . . . 5
⊢ (K ∈ ℤ → ((sin ‘(K · (2 · π))) = 0 ↔
(sin ‘(-K · (2 ·
π))) = 0)) |
| 32 | 22, 31 | anbi12d 630 |
. . . 4
⊢ (K ∈ ℤ → (((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0) ↔
((cos ‘(-K · (2 ·
π))) = 1 ⋀ (sin ‘(-K · (2 · π))) =
0))) |
| 33 | 32 | orbi2d 616 |
. . 3
⊢ (K ∈ ℤ → ((((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0) ⋁ ((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0)) ↔
(((cos ‘(K · (2 ·
π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0) ⋁ ((cos ‘(-K · (2 · π))) = 1 ⋀ (sin ‘(-K · (2 · π))) =
0)))) |
| 34 | 6, 33 | mpbird 196 |
. 2
⊢ (K ∈ ℤ → (((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0) ⋁ ((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) =
0))) |
| 35 | | oridm 243 |
. 2
⊢ ((((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0) ⋁ ((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) = 0)) ↔
((cos ‘(K · (2 ·
π))) = 1 ⋀ (sin ‘(K · (2 · π))) =
0)) |
| 36 | 34, 35 | sylib 198 |
1
⊢ (K ∈ ℤ → ((cos ‘(K · (2 · π))) = 1 ⋀ (sin ‘(K · (2 · π))) =
0)) |