Jawabanmu

2014-07-18T22:26:44+07:00
Sin (105) = sin (45+60)
sin (a+b) = sin a . cos b + cos a . sin b
sin (45+60) = sin 45. cos 60 + cos 45 . sin 60

=  \frac{1}{2}  \sqrt{2} .  \frac{1}{2} +  \frac{1}{2}  \sqrt{2} .  \frac{1}{2}  \sqrt{3}

=  \frac{1}{4}  \sqrt{2} +  \frac{1}{4}  \sqrt{6}

:)
cool
bener kan?
kayanya sih benar,soalnya diuraikan ya
(y)
2014-07-18T22:33:21+07:00
-walaupun uda di jawab,mau ngelatih ngerjain trigonom ya..
sin 105 = sin(45+60)
sin (45+60) = sin 45 cos 60 + cos 45 sin 60
                 = 1/2 √2 . 1/2 + 1/2√2 . 1/2√3
                 = 1/4 √2 + 1/4 √6
                 = 1/4 (√2 + √6)