Arc-ed up

Geometry Level 2

arcsin1+arccos1+arctan1+arccot1+arcsec1+arccsc1= ?\large \arcsin 1 + \arccos 1 + \arctan 1 + \text{arccot} \, 1 + \text{arcsec} \, 1 + \text{arccsc} \,1 = \ ?

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