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Theorem muladdd 7955
Description: Product of two sums. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
mulm1d.1  |-  ( ph  ->  A  e.  CC )
mulnegd.2  |-  ( ph  ->  B  e.  CC )
subdid.3  |-  ( ph  ->  C  e.  CC )
muladdd.4  |-  ( ph  ->  D  e.  CC )
Assertion
Ref Expression
muladdd  |-  ( ph  ->  ( ( A  +  B )  x.  ( C  +  D )
)  =  ( ( ( A  x.  C
)  +  ( D  x.  B ) )  +  ( ( A  x.  D )  +  ( C  x.  B
) ) ) )

Proof of Theorem muladdd
StepHypRef Expression
1 mulm1d.1 . 2  |-  ( ph  ->  A  e.  CC )
2 mulnegd.2 . 2  |-  ( ph  ->  B  e.  CC )
3 subdid.3 . 2  |-  ( ph  ->  C  e.  CC )
4 muladdd.4 . 2  |-  ( ph  ->  D  e.  CC )
5 muladd 7923 . 2  |-  ( ( ( A  e.  CC  /\  B  e.  CC )  /\  ( C  e.  CC  /\  D  e.  CC ) )  -> 
( ( A  +  B )  x.  ( C  +  D )
)  =  ( ( ( A  x.  C
)  +  ( D  x.  B ) )  +  ( ( A  x.  D )  +  ( C  x.  B
) ) ) )
61, 2, 3, 4, 5syl22anc 1176 1  |-  ( ph  ->  ( ( A  +  B )  x.  ( C  +  D )
)  =  ( ( ( A  x.  C
)  +  ( D  x.  B ) )  +  ( ( A  x.  D )  +  ( C  x.  B
) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1290    e. wcel 1439  (class class class)co 5666   CCcc 7409    + caddc 7414    x. cmul 7416
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 666  ax-5 1382  ax-7 1383  ax-gen 1384  ax-ie1 1428  ax-ie2 1429  ax-8 1441  ax-10 1442  ax-11 1443  ax-i12 1444  ax-bndl 1445  ax-4 1446  ax-17 1465  ax-i9 1469  ax-ial 1473  ax-i5r 1474  ax-ext 2071  ax-addcl 7502  ax-mulcl 7504  ax-addcom 7506  ax-mulcom 7507  ax-addass 7508  ax-distr 7510
This theorem depends on definitions:  df-bi 116  df-3an 927  df-tru 1293  df-nf 1396  df-sb 1694  df-clab 2076  df-cleq 2082  df-clel 2085  df-nfc 2218  df-rex 2366  df-v 2622  df-un 3004  df-sn 3456  df-pr 3457  df-op 3459  df-uni 3660  df-br 3852  df-iota 4993  df-fv 5036  df-ov 5669
This theorem is referenced by:  mulreim  8142  sinadd  11088  cosadd  11089
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