Theorem muladdd 8694

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 8662	. 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 1275	1 |- ( ph -> ( ( A + B ) x. ( C + D ) ) = ( ( ( A x. C ) + ( D x. B ) ) + ( ( A x. D ) + ( C x. B ) ) ) )

Syntax hints:   -> wi 4   = wceq 1398   e. wcel 2205  (class class class)co 6052   CCcc 8130   + caddc 8135   x. cmul 8137

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216  ax-addcl 8228  ax-mulcl 8230  ax-addcom 8232  ax-mulcom 8233  ax-addass 8234  ax-distr 8236

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-rex 2528  df-v 2817  df-un 3217  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-iota 5314  df-fv 5362  df-ov 6055

This theorem is referenced by:  mulreim  8883  sinadd  12430  cosadd  12431  lgsquad2lem1  16003