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inv sin
De schuine zijde van de rechthoekige driehoek is 1.
De zijde tegenover hoek [i]A[/i] heeft lengte [i]a[/i].
[i]a[/i] is dan de sinus van hoek [i]A[/i].
inv sin [i]a[/i] is dus de grootte van hoek [i]A[/i].