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Mirrors > Home > MPE Home > Th. List > Mathboxes > acos1half | Structured version Visualization version GIF version |
Description: The arccosine of 1 / 2 is π / 3. (Contributed by SN, 31-Aug-2024.) |
Ref | Expression |
---|---|
acos1half | ⊢ (arccos‘(1 / 2)) = (π / 3) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sincos3rdpi 25360 | . . . 4 ⊢ ((sin‘(π / 3)) = ((√‘3) / 2) ∧ (cos‘(π / 3)) = (1 / 2)) | |
2 | 1 | simpri 489 | . . 3 ⊢ (cos‘(π / 3)) = (1 / 2) |
3 | 2 | fveq2i 6698 | . 2 ⊢ (arccos‘(cos‘(π / 3))) = (arccos‘(1 / 2)) |
4 | pire 25302 | . . . . 5 ⊢ π ∈ ℝ | |
5 | 3re 11875 | . . . . 5 ⊢ 3 ∈ ℝ | |
6 | 3ne0 11901 | . . . . 5 ⊢ 3 ≠ 0 | |
7 | 4, 5, 6 | redivcli 11564 | . . . 4 ⊢ (π / 3) ∈ ℝ |
8 | 7 | recni 10812 | . . 3 ⊢ (π / 3) ∈ ℂ |
9 | rere 14650 | . . . . 5 ⊢ ((π / 3) ∈ ℝ → (ℜ‘(π / 3)) = (π / 3)) | |
10 | 7, 9 | ax-mp 5 | . . . 4 ⊢ (ℜ‘(π / 3)) = (π / 3) |
11 | 7 | rexri 10856 | . . . . 5 ⊢ (π / 3) ∈ ℝ* |
12 | pipos 25304 | . . . . . 6 ⊢ 0 < π | |
13 | 3pos 11900 | . . . . . 6 ⊢ 0 < 3 | |
14 | 4, 5, 12, 13 | divgt0ii 11714 | . . . . 5 ⊢ 0 < (π / 3) |
15 | picn 25303 | . . . . . . . 8 ⊢ π ∈ ℂ | |
16 | 4, 12 | gt0ne0ii 11333 | . . . . . . . 8 ⊢ π ≠ 0 |
17 | 15, 16 | dividi 11530 | . . . . . . 7 ⊢ (π / π) = 1 |
18 | 1lt3 11968 | . . . . . . 7 ⊢ 1 < 3 | |
19 | 17, 18 | eqbrtri 5060 | . . . . . 6 ⊢ (π / π) < 3 |
20 | 4, 5, 4, 13, 12 | ltdiv23ii 11724 | . . . . . 6 ⊢ ((π / 3) < π ↔ (π / π) < 3) |
21 | 19, 20 | mpbir 234 | . . . . 5 ⊢ (π / 3) < π |
22 | 0xr 10845 | . . . . . 6 ⊢ 0 ∈ ℝ* | |
23 | 4 | rexri 10856 | . . . . . 6 ⊢ π ∈ ℝ* |
24 | elioo1 12940 | . . . . . 6 ⊢ ((0 ∈ ℝ* ∧ π ∈ ℝ*) → ((π / 3) ∈ (0(,)π) ↔ ((π / 3) ∈ ℝ* ∧ 0 < (π / 3) ∧ (π / 3) < π))) | |
25 | 22, 23, 24 | mp2an 692 | . . . . 5 ⊢ ((π / 3) ∈ (0(,)π) ↔ ((π / 3) ∈ ℝ* ∧ 0 < (π / 3) ∧ (π / 3) < π)) |
26 | 11, 14, 21, 25 | mpbir3an 1343 | . . . 4 ⊢ (π / 3) ∈ (0(,)π) |
27 | 10, 26 | eqeltri 2827 | . . 3 ⊢ (ℜ‘(π / 3)) ∈ (0(,)π) |
28 | acoscos 25730 | . . 3 ⊢ (((π / 3) ∈ ℂ ∧ (ℜ‘(π / 3)) ∈ (0(,)π)) → (arccos‘(cos‘(π / 3))) = (π / 3)) | |
29 | 8, 27, 28 | mp2an 692 | . 2 ⊢ (arccos‘(cos‘(π / 3))) = (π / 3) |
30 | 3, 29 | eqtr3i 2761 | 1 ⊢ (arccos‘(1 / 2)) = (π / 3) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∧ w3a 1089 = wceq 1543 ∈ wcel 2112 class class class wbr 5039 ‘cfv 6358 (class class class)co 7191 ℂcc 10692 ℝcr 10693 0cc0 10694 1c1 10695 ℝ*cxr 10831 < clt 10832 / cdiv 11454 2c2 11850 3c3 11851 (,)cioo 12900 ℜcre 14625 √csqrt 14761 sincsin 15588 cosccos 15589 πcpi 15591 arccoscacos 25700 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-rep 5164 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 ax-un 7501 ax-inf2 9234 ax-cnex 10750 ax-resscn 10751 ax-1cn 10752 ax-icn 10753 ax-addcl 10754 ax-addrcl 10755 ax-mulcl 10756 ax-mulrcl 10757 ax-mulcom 10758 ax-addass 10759 ax-mulass 10760 ax-distr 10761 ax-i2m1 10762 ax-1ne0 10763 ax-1rid 10764 ax-rnegex 10765 ax-rrecex 10766 ax-cnre 10767 ax-pre-lttri 10768 ax-pre-lttrn 10769 ax-pre-ltadd 10770 ax-pre-mulgt0 10771 ax-pre-sup 10772 ax-addf 10773 ax-mulf 10774 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rmo 3059 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-pss 3872 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-tp 4532 df-op 4534 df-uni 4806 df-int 4846 df-iun 4892 df-iin 4893 df-br 5040 df-opab 5102 df-mpt 5121 df-tr 5147 df-id 5440 df-eprel 5445 df-po 5453 df-so 5454 df-fr 5494 df-se 5495 df-we 5496 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-pred 6140 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6316 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-isom 6367 df-riota 7148 df-ov 7194 df-oprab 7195 df-mpo 7196 df-of 7447 df-om 7623 df-1st 7739 df-2nd 7740 df-supp 7882 df-wrecs 8025 df-recs 8086 df-rdg 8124 df-1o 8180 df-2o 8181 df-er 8369 df-map 8488 df-pm 8489 df-ixp 8557 df-en 8605 df-dom 8606 df-sdom 8607 df-fin 8608 df-fsupp 8964 df-fi 9005 df-sup 9036 df-inf 9037 df-oi 9104 df-card 9520 df-pnf 10834 df-mnf 10835 df-xr 10836 df-ltxr 10837 df-le 10838 df-sub 11029 df-neg 11030 df-div 11455 df-nn 11796 df-2 11858 df-3 11859 df-4 11860 df-5 11861 df-6 11862 df-7 11863 df-8 11864 df-9 11865 df-n0 12056 df-z 12142 df-dec 12259 df-uz 12404 df-q 12510 df-rp 12552 df-xneg 12669 df-xadd 12670 df-xmul 12671 df-ioo 12904 df-ioc 12905 df-ico 12906 df-icc 12907 df-fz 13061 df-fzo 13204 df-fl 13332 df-mod 13408 df-seq 13540 df-exp 13601 df-fac 13805 df-bc 13834 df-hash 13862 df-shft 14595 df-cj 14627 df-re 14628 df-im 14629 df-sqrt 14763 df-abs 14764 df-limsup 14997 df-clim 15014 df-rlim 15015 df-sum 15215 df-ef 15592 df-sin 15594 df-cos 15595 df-pi 15597 df-struct 16668 df-ndx 16669 df-slot 16670 df-base 16672 df-sets 16673 df-ress 16674 df-plusg 16762 df-mulr 16763 df-starv 16764 df-sca 16765 df-vsca 16766 df-ip 16767 df-tset 16768 df-ple 16769 df-ds 16771 df-unif 16772 df-hom 16773 df-cco 16774 df-rest 16881 df-topn 16882 df-0g 16900 df-gsum 16901 df-topgen 16902 df-pt 16903 df-prds 16906 df-xrs 16961 df-qtop 16966 df-imas 16967 df-xps 16969 df-mre 17043 df-mrc 17044 df-acs 17046 df-mgm 18068 df-sgrp 18117 df-mnd 18128 df-submnd 18173 df-mulg 18443 df-cntz 18665 df-cmn 19126 df-psmet 20309 df-xmet 20310 df-met 20311 df-bl 20312 df-mopn 20313 df-fbas 20314 df-fg 20315 df-cnfld 20318 df-top 21745 df-topon 21762 df-topsp 21784 df-bases 21797 df-cld 21870 df-ntr 21871 df-cls 21872 df-nei 21949 df-lp 21987 df-perf 21988 df-cn 22078 df-cnp 22079 df-haus 22166 df-tx 22413 df-hmeo 22606 df-fil 22697 df-fm 22789 df-flim 22790 df-flf 22791 df-xms 23172 df-ms 23173 df-tms 23174 df-cncf 23729 df-limc 24717 df-dv 24718 df-log 25399 df-asin 25702 df-acos 25703 |
This theorem is referenced by: (None) |
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