Theorem muladdd 8369

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 8337	. 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 1239	1 |- ( ph -> ( ( A + B ) x. ( C + D ) ) = ( ( ( A x. C ) + ( D x. B ) ) + ( ( A x. D ) + ( C x. B ) ) ) )

Syntax hints:   -> wi 4   = wceq 1353   e. wcel 2148  (class class class)co 5872   CCcc 7806   + caddc 7811   x. cmul 7813

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159  ax-addcl 7904  ax-mulcl 7906  ax-addcom 7908  ax-mulcom 7909  ax-addass 7910  ax-distr 7912

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-rex 2461  df-v 2739  df-un 3133  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4003  df-iota 5177  df-fv 5223  df-ov 5875

This theorem is referenced by:  mulreim  8557  sinadd  11737  cosadd  11738