How would you translate both are true?

[Spanish11]

Ambos son verdaderos o ambos son ciertos?

[Rusty]

Both adjectives are synonymous. You may alternate for variety.

[Spanish11]

Thank you

[AngelicaDeAlquezar]

I agree with Rusty, but if your sentence is used in a formal mathematical context, it should be "verdadero", because of specific jargon. ;)