Jawabanmu

2014-03-21T10:11:10+07:00
Sin 45 = 1/2 akar2
cos 45 = 1/2 akar2
1/2 akar2 . 1/2 akar2 = 1/4 .2 = 1/2
2014-03-21T10:20:29+07:00
Ni saya jawap kalo gak salah ya...
sin 45°.cos 45° = √2/2 x √2/2 = 2/4 = 1/2