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Karena sudut lancip, semua komponen x, y, dan r adalah positif.
Maka:
tan h = 5/√11
tan h = y/x
Maka berlaku:
x = √11
y = 5
r = √(11+5²)= √36 = 6
Sehingga:
cos h = x/r
cos h = √11/6 [C]