koosinus tähendus null.

cosine [cosines]▼◼◼◼noun
[UK: ˈkəʊ.saɪn] [US: ˈkoʊ.saɪn]

arccosine▼◼◼◼[UK: ˈɑːkəʊsˌaɪn] [US: ˈɑːrkoʊsˌaɪn]

secant▼◼◼◼[UK: ˈsiːkənt] [US: ˈsiːkænt]