how do I find sin 5ᴨ/8, cos 5ᴨ/8 and tan 5ᴨ/8 using trig identities

how do I find sin 5ᴨ/8, cos 5ᴨ/8 and tan 5ᴨ/8 using trig identities

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What is ᴨ

use formula for sin4x

the problem doesn't say...just says to use trigonometric identities to find the values

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