Jawabanmu

2014-02-11T22:03:57+07:00
Sin2x=2sinxcosx
(sinxcos60-cosxsin60)+(sinxcos60+cosxsin60)=p
2sinxcos60=p
sinx=p
(sinx)^2+(cosx)^2=1
p^2+(cosx)^2=1
(cosx)^2=1-p^2
cosx=-1/1
sin2x=2p.1 atau 2p.-1
jadi sinx = 2p atau -2p
kalo ada yg salah bilang ya, kita sama2 belajar ^_^
sori, cosx=(1-p^2)^1/2 jadi sin2x=2p(1-p^2)^1/2