Jawabanmu

2013-12-15T12:06:00+07:00
2013-12-15T12:25:52+07:00
Sin (15) = Sin (45-30)
Sin (A-B) = Sin A Cos B - Sin B Cos A
Sin (45-30) = Sin 45 Cos 30 - Sin 30 Cos 45
Sin (15) =  \frac{1}{2}  \sqrt[]{2} .  \frac{1}{2}  \sqrt[]{3} -  \frac{1}{2} .  \frac{1}{2}  \sqrt[]{2}
Sin (15) =  \frac{1}{4}  \sqrt{6} -  \frac{1}{4}  \sqrt{2}
Sin (15) =  \frac{ \sqrt{6} -  \sqrt{2} }{4}

kalo yang cos sama caranya kayak diatas
nanti hasilnya jadi  \frac{ \sqrt{6} +  \sqrt{2} }{4}

Kalo tan tinggal  \frac{Sin (15)}{Cos (15)} aja
ntar hasilnya jadi 2 -  \sqrt{3}