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Metamath Proof Explorer

Theorem acoscl

Description: Closure for the arccos function. (Contributed by Mario Carneiro, 31-Mar-2015)

		Ref	Expression
	Assertion	acoscl	$⊢ A \in ℂ \to arccos (A) \in ℂ$

Step	Hyp	Ref	Expression
1		acosf	$⊢ arccos : ℂ ⟶ ℂ$
2	1	ffvelcdmi	$⊢ A \in ℂ \to arccos (A) \in ℂ$