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x = 2√2 dan y = -2√6 (di kuadran IV) besar sudut 270 <α < 360
r = √x²+y²
= √8+24
= √32
= 4√2
tan α = y/x
= -2√6/2√2
= -√6/√2
= -√3
besar α = 300
jadi koordinat kutubny adalah (4√2, 300)