Jawabanmu

2014-03-23T22:02:06+07:00
1.  \frac{1}{tan  \alpha } -  \frac{1}{cot  \alpha } = cot \alpha - \frac{1}{cot  \alpha }
   =  \frac{cot \alpha  - 1}{cot \alpha }
2. sin^{2}  \alpha - cos^{2}   \alpha  = ....
    1-cos^{2}  \alpha - cos^{2}  \alpha = 1 - 2 cos^{2}  \alpha

ga tau deh bener apa salaj, maaf :)
1 5 1