8.
Rumus-rumus
umum bagi sebarang sudut
latex \color{blue}\large\bf\alpha +k.360^\circ
latex \color{blue}sin(\alpha +k.360^\circ )=sin\alpha
latex \color{blue}cos(\alpha +k.360^\circ )=cos\alpha
latex \color{blue}tan(\alpha +k.360^\circ )=tan\alpha
dengan latex k bilangan bulat.
Sudut negatif
latex sin(-\alpha )=\frac{-a}{r}=-sin\alpha
latex cos(-\alpha )=\frac{b}{r}=cos\alpha
latex tan(-\alpha )=\frac{-a}{b}=-tan\alpha
latex \color{blue}\large\bf\alpha +k.180^\circ
latex \color{Orchid}sin(\alpha \pm k.180^\circ )=-sin\alpha
latex \color{Orchid}cos(\pm \alpha \pm k.180^\circ)=-cos\alpha
latex \color{Orchid}tan(\alpha \pm k.180^\circ)=tan\alpha
sehingga diperoleh bentuk umum:
latex \color{blue}sin(\alpha +k.180^\circ )=(-1)^{k}\ sin\alpha
latex \color{blue}cos(\pm \alpha +k.180^\circ )=(-1)^{k}\ cos\alpha
latex \color{blue}tan(\alpha +k.180^\circ )=tan\alpha
dengan latex k bilangan bulat.
Adjie Gumarang Pujakelana, 2013
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