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

Step	Hyp	Ref	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 ) ) ) )
6	1, 2, 3, 4, 5	syl22anc 1176	1 |- ( ph -> ( ( A + B ) x. ( C + D ) ) = ( ( ( A x. C ) + ( D x. B ) ) + ( ( A x. D ) + ( C x. B ) ) ) )

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