Theorem sinpi

Description: The sine of _pi is 0. (Contributed by Paul Chapman, 23-Jan-2008)

	Ref	Expression
Assertion	sinpi	⊢ ( sin ‘ π ) = 0

Proof

Step	Hyp	Ref	Expression
1		pilem3	⊢ ( π ∈ ( 2 (,) 4 ) ∧ ( sin ‘ π ) = 0 )
2	1	simpri	⊢ ( sin ‘ π ) = 0