Metamath Proof Explorer

Theorem sinpi

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

Ref Expression
Assertion sinpi 
|- ( sin ` _pi ) = 0

Proof

Step Hyp Ref Expression
1 pilem3 
 |-  ( _pi e. ( 2 (,) 4 ) /\ ( sin ` _pi ) = 0 )
2 1 simpri 
 |-  ( sin ` _pi ) = 0