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Maka, pada kuadran IV.
x = a
r = 1
Dan,
y = -√(1-a²)
Sehingga,
Kalau soalnya cos x, tentu cos x = a juga.
Kalau yang lain, semisal:
sin x = y/x
sin x = - √(1-a²)
tan x = -√(1-a²) / a