RT
arccos 0 =?
Is é an arccosine an fheidhm chosine inbhéartach.
Ó
cos 0 = cos 0º = 1
Tá an t-arccosine de 0 cothrom le feidhm chosain inbhéartach 0, atá cothrom le rad / 2 raidian nó 90 céim:
arccos 0 = cos -1 0 = π / 2 rad = 90º
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