1. Sin 30'' cos 60'' + sin 60'' cos 30'' ....
2. sin 60'' cotg 30'' tg 45'' ....
3. 2 tan 30'' 1- tan2 30''
4. sin 30'' - sin 60'' - cos 30'' - cos 60'' ....

Please Tolong bantu aku, pake cara kerjanya yah !!!! makasih ...

2

Jawabanmu

2014-05-03T17:52:23+07:00
1. sin (30+60) = sin 90 = 1
2. akar3 /2 x akar 3 x 1 = 3/2
3. 2 akar3/3 x sec^2 30 = 2 akar3/3 x 4/3 = 8akar3 / 9
4. 1/2 - akar3/2 - akar3/2 - 1/2 = -2akar3/2 
Jawaban paling cerdas!
2014-05-03T17:53:49+07:00
1. Sin 30'' cos 60'' + sin 60'' cos 30'' = 1/2(1/2) + (1/2 √3)(1/2)√3
                                                         = 1/4 +3/4
                                                         = 1
2. sin 60'' cotg 30'' tg 45'' = 1/2 √3(√3)(1) = 3/2
3. 2 tan 30' (1- tan²30'') = 2(1/3 √3)(1 - (1/3√3)²) =4/9 √3
4. sin 30'' - sin 60'' - cos 30'' - cos 60'' = 1/2 - 1/2√3 - 1/2√3 - 1/2 = -√3
1 5 1