Jawabanmu

2014-06-09T20:08:24+07:00
Cos 150 = - sin 60 = - 1/2  \sqrt{3}
sin 45 = 1/2  \sqrt{2}
1/2 cos 330 = 1/2 sin 60 = 1/4  \sqrt{3}

cos 150+sin 45+1/2 cos 330= - \frac{ \sqrt{3} }{2}  + \frac{ \sqrt{2} }{2} +  \frac{ \sqrt{3} }{4}
= \frac{2 \sqrt{2} }{4} - \frac{ \sqrt{3} }{4}  \frac{ 2\sqrt{2}- \sqrt{3}  }{4}
cos 150 = - sin 30 = - 1/2
sin 45 = 1/2 \sqrt{2}
1/2 cos 330 = 1/2 sin 60 = 1/4 \sqrt{3}

cos 150+sin 45+1/2 sin60= - \frac{1}{2} + \frac{ \sqrt{2} }{2} + \frac{ \sqrt{3} }{4}
jawaban dari mana kok cos 150=-sin 30
oh ya maaf harusnya - sin 60
cos 150 + sin 45 + 1/2 cos 330= -sin 60 + sin 45 + 1/2 sin 60
- \frac{1}{2} \sqrt{3} + \frac{1}{2} \sqrt{2} + \frac{1}{4} \sqrt{3}
2014-06-09T20:32:06+07:00
Cos 150 + sin 45 + 1/2 cos 330
= cos ( 90 + 60 ) + sin 45 + 1/2 cos ( 270 + 60 )
= sin 60 + sin 45 + 1/2 sin 60
 \frac{1}{2}  \sqrt{3}  \frac{1}{2}  \sqrt{2} + 1/2 .  \frac{1}{2}  \sqrt{3}
 \frac{1}{2}  \sqrt{3}  \frac{1}{2}  \sqrt{2}  \frac{1}{4}  \sqrt{3}
 \frac{2}{4}  \sqrt{3}  \frac{1}{2}  \sqrt{2}  \frac{1}{4}  \sqrt{3}
 \frac{3}{4}  \sqrt{3}  \frac{1}{2}  \sqrt{2}