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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

\frac{1}{2}\left(-1\right)
Tīkina te uara \cos(180) mai i te ripanga uara pākoki.
-\frac{1}{2}
Whakareatia te \frac{1}{2} ki te -1, ka -\frac{1}{2}.