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sin α = 3/4
y = 3
r = 4
Maka,
x = -√7 (Phytagoras dan nilai x negatif)
Untuk β sudut lancip
cos β = 1/√3
x = 1
r = √3
Maka,
y = √2 (Phytagoras dan y positif)
Sehingga,