Theorem sq3

Description: The square of 3 is 9. (Contributed by NM, 26-Apr-2006)

	Ref	Expression
Assertion	sq3	|- ( 3 ^ 2 ) = 9

Proof

Step	Hyp	Ref	Expression
1		3cn	|- 3 e. CC
2	1	sqvali	|- ( 3 ^ 2 ) = ( 3 x. 3 )
3		3t3e9	|- ( 3 x. 3 ) = 9
4	2 3	eqtri	|- ( 3 ^ 2 ) = 9