Theorem sinhalfpi

Description: The sine of _pi / 2 is 1. (Contributed by Paul Chapman, 23-Jan-2008)

	Ref	Expression
Assertion	sinhalfpi	⊢ ( sin ‘ ( π / 2 ) ) = 1

Proof

Step	Hyp	Ref	Expression
1		sinhalfpilem	⊢ ( ( sin ‘ ( π / 2 ) ) = 1 ∧ ( cos ‘ ( π / 2 ) ) = 0 )
2	1	simpli	⊢ ( sin ‘ ( π / 2 ) ) = 1