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Theorem sincossq 12452
Description: Sine squared plus cosine squared is 1. Equation 17 of [Gleason] p. 311. Note that this holds for non-real arguments, even though individually each term is unbounded. (Contributed by NM, 15-Jan-2006.)
Assertion
Ref Expression
sincossq  |-  ( A  e.  CC  ->  (
( ( sin `  A
) ^ 2 )  +  ( ( cos `  A ) ^ 2 ) )  =  1 )

Proof of Theorem sincossq
StepHypRef Expression
1 negcl 9048 . . 3  |-  ( A  e.  CC  ->  -u A  e.  CC )
2 cosadd 12441 . . 3  |-  ( ( A  e.  CC  /\  -u A  e.  CC )  ->  ( cos `  ( A  +  -u A ) )  =  ( ( ( cos `  A
)  x.  ( cos `  -u A ) )  -  ( ( sin `  A )  x.  ( sin `  -u A ) ) ) )
31, 2mpdan 649 . 2  |-  ( A  e.  CC  ->  ( cos `  ( A  +  -u A ) )  =  ( ( ( cos `  A )  x.  ( cos `  -u A ) )  -  ( ( sin `  A )  x.  ( sin `  -u A ) ) ) )
4 negid 9090 . . . 4  |-  ( A  e.  CC  ->  ( A  +  -u A )  =  0 )
54fveq2d 5490 . . 3  |-  ( A  e.  CC  ->  ( cos `  ( A  +  -u A ) )  =  ( cos `  0
) )
6 cos0 12426 . . 3  |-  ( cos `  0 )  =  1
75, 6syl6eq 2332 . 2  |-  ( A  e.  CC  ->  ( cos `  ( A  +  -u A ) )  =  1 )
8 sincl 12402 . . . . 5  |-  ( A  e.  CC  ->  ( sin `  A )  e.  CC )
98sqcld 11239 . . . 4  |-  ( A  e.  CC  ->  (
( sin `  A
) ^ 2 )  e.  CC )
10 coscl 12403 . . . . 5  |-  ( A  e.  CC  ->  ( cos `  A )  e.  CC )
1110sqcld 11239 . . . 4  |-  ( A  e.  CC  ->  (
( cos `  A
) ^ 2 )  e.  CC )
129, 11addcomd 9010 . . 3  |-  ( A  e.  CC  ->  (
( ( sin `  A
) ^ 2 )  +  ( ( cos `  A ) ^ 2 ) )  =  ( ( ( cos `  A
) ^ 2 )  +  ( ( sin `  A ) ^ 2 ) ) )
1310sqvald 11238 . . . . 5  |-  ( A  e.  CC  ->  (
( cos `  A
) ^ 2 )  =  ( ( cos `  A )  x.  ( cos `  A ) ) )
14 cosneg 12423 . . . . . 6  |-  ( A  e.  CC  ->  ( cos `  -u A )  =  ( cos `  A
) )
1514oveq2d 5836 . . . . 5  |-  ( A  e.  CC  ->  (
( cos `  A
)  x.  ( cos `  -u A ) )  =  ( ( cos `  A )  x.  ( cos `  A ) ) )
1613, 15eqtr4d 2319 . . . 4  |-  ( A  e.  CC  ->  (
( cos `  A
) ^ 2 )  =  ( ( cos `  A )  x.  ( cos `  -u A ) ) )
178sqvald 11238 . . . . . 6  |-  ( A  e.  CC  ->  (
( sin `  A
) ^ 2 )  =  ( ( sin `  A )  x.  ( sin `  A ) ) )
18 sinneg 12422 . . . . . . . . 9  |-  ( A  e.  CC  ->  ( sin `  -u A )  = 
-u ( sin `  A
) )
1918negeqd 9042 . . . . . . . 8  |-  ( A  e.  CC  ->  -u ( sin `  -u A )  = 
-u -u ( sin `  A
) )
208negnegd 9144 . . . . . . . 8  |-  ( A  e.  CC  ->  -u -u ( sin `  A )  =  ( sin `  A
) )
2119, 20eqtrd 2316 . . . . . . 7  |-  ( A  e.  CC  ->  -u ( sin `  -u A )  =  ( sin `  A
) )
2221oveq2d 5836 . . . . . 6  |-  ( A  e.  CC  ->  (
( sin `  A
)  x.  -u ( sin `  -u A ) )  =  ( ( sin `  A )  x.  ( sin `  A ) ) )
2317, 22eqtr4d 2319 . . . . 5  |-  ( A  e.  CC  ->  (
( sin `  A
) ^ 2 )  =  ( ( sin `  A )  x.  -u ( sin `  -u A ) ) )
241sincld 12406 . . . . . 6  |-  ( A  e.  CC  ->  ( sin `  -u A )  e.  CC )
258, 24mulneg2d 9229 . . . . 5  |-  ( A  e.  CC  ->  (
( sin `  A
)  x.  -u ( sin `  -u A ) )  =  -u ( ( sin `  A )  x.  ( sin `  -u A ) ) )
2623, 25eqtrd 2316 . . . 4  |-  ( A  e.  CC  ->  (
( sin `  A
) ^ 2 )  =  -u ( ( sin `  A )  x.  ( sin `  -u A ) ) )
2716, 26oveq12d 5838 . . 3  |-  ( A  e.  CC  ->  (
( ( cos `  A
) ^ 2 )  +  ( ( sin `  A ) ^ 2 ) )  =  ( ( ( cos `  A
)  x.  ( cos `  -u A ) )  +  -u ( ( sin `  A )  x.  ( sin `  -u A ) ) ) )
281coscld 12407 . . . . 5  |-  ( A  e.  CC  ->  ( cos `  -u A )  e.  CC )
2910, 28mulcld 8851 . . . 4  |-  ( A  e.  CC  ->  (
( cos `  A
)  x.  ( cos `  -u A ) )  e.  CC )
308, 24mulcld 8851 . . . 4  |-  ( A  e.  CC  ->  (
( sin `  A
)  x.  ( sin `  -u A ) )  e.  CC )
3129, 30negsubd 9159 . . 3  |-  ( A  e.  CC  ->  (
( ( cos `  A
)  x.  ( cos `  -u A ) )  +  -u ( ( sin `  A )  x.  ( sin `  -u A ) ) )  =  ( ( ( cos `  A
)  x.  ( cos `  -u A ) )  -  ( ( sin `  A )  x.  ( sin `  -u A ) ) ) )
3212, 27, 313eqtrrd 2321 . 2  |-  ( A  e.  CC  ->  (
( ( cos `  A
)  x.  ( cos `  -u A ) )  -  ( ( sin `  A )  x.  ( sin `  -u A ) ) )  =  ( ( ( sin `  A
) ^ 2 )  +  ( ( cos `  A ) ^ 2 ) ) )
333, 7, 323eqtr3rd 2325 1  |-  ( A  e.  CC  ->  (
( ( sin `  A
) ^ 2 )  +  ( ( cos `  A ) ^ 2 ) )  =  1 )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1623    e. wcel 1685   ` cfv 5221  (class class class)co 5820   CCcc 8731   0cc0 8733   1c1 8734    + caddc 8736    x. cmul 8738    - cmin 9033   -ucneg 9034   2c2 9791   ^cexp 11100   sincsin 12341   cosccos 12342
This theorem is referenced by:  cos2t  12454  cos2tsin  12455  sinbnd  12456  cosbnd  12457  absefi  12472  sinhalfpilem  19830  sincos6thpi  19879  efif1olem4  19903  asinsin  20184  atandmtan  20212  basellem8  20321  itgsinexp  27160  onetansqsecsq  27503  cotsqcscsq  27504
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1636  ax-8 1644  ax-13 1687  ax-14 1689  ax-6 1704  ax-7 1709  ax-11 1716  ax-12 1868  ax-ext 2265  ax-rep 4132  ax-sep 4142  ax-nul 4150  ax-pow 4187  ax-pr 4213  ax-un 4511  ax-inf2 7338  ax-cnex 8789  ax-resscn 8790  ax-1cn 8791  ax-icn 8792  ax-addcl 8793  ax-addrcl 8794  ax-mulcl 8795  ax-mulrcl 8796  ax-mulcom 8797  ax-addass 8798  ax-mulass 8799  ax-distr 8800  ax-i2m1 8801  ax-1ne0 8802  ax-1rid 8803  ax-rnegex 8804  ax-rrecex 8805  ax-cnre 8806  ax-pre-lttri 8807  ax-pre-lttrn 8808  ax-pre-ltadd 8809  ax-pre-mulgt0 8810  ax-pre-sup 8811  ax-addf 8812  ax-mulf 8813
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1631  df-eu 2148  df-mo 2149  df-clab 2271  df-cleq 2277  df-clel 2280  df-nfc 2409  df-ne 2449  df-nel 2450  df-ral 2549  df-rex 2550  df-reu 2551  df-rmo 2552  df-rab 2553  df-v 2791  df-sbc 2993  df-csb 3083  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-pss 3169  df-nul 3457  df-if 3567  df-pw 3628  df-sn 3647  df-pr 3648  df-tp 3649  df-op 3650  df-uni 3829  df-int 3864  df-iun 3908  df-br 4025  df-opab 4079  df-mpt 4080  df-tr 4115  df-eprel 4304  df-id 4308  df-po 4313  df-so 4314  df-fr 4351  df-se 4352  df-we 4353  df-ord 4394  df-on 4395  df-lim 4396  df-suc 4397  df-om 4656  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-rn 4699  df-res 4700  df-ima 4701  df-fun 5223  df-fn 5224  df-f 5225  df-f1 5226  df-fo 5227  df-f1o 5228  df-fv 5229  df-isom 5230  df-ov 5823  df-oprab 5824  df-mpt2 5825  df-1st 6084  df-2nd 6085  df-iota 6253  df-riota 6300  df-recs 6384  df-rdg 6419  df-1o 6475  df-oadd 6479  df-er 6656  df-pm 6771  df-en 6860  df-dom 6861  df-sdom 6862  df-fin 6863  df-sup 7190  df-oi 7221  df-card 7568  df-pnf 8865  df-mnf 8866  df-xr 8867  df-ltxr 8868  df-le 8869  df-sub 9035  df-neg 9036  df-div 9420  df-nn 9743  df-2 9800  df-3 9801  df-n0 9962  df-z 10021  df-uz 10227  df-rp 10351  df-ico 10658  df-fz 10779  df-fzo 10867  df-fl 10921  df-seq 11043  df-exp 11101  df-fac 11285  df-bc 11312  df-hash 11334  df-shft 11558  df-cj 11580  df-re 11581  df-im 11582  df-sqr 11716  df-abs 11717  df-limsup 11941  df-clim 11958  df-rlim 11959  df-sum 12155  df-ef 12345  df-sin 12347  df-cos 12348
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