Jawabanmu

2014-03-02T21:09:12+07:00
Cos 390 derajat + Sec 570 derajat = cos (k.360+x ) + sec (k.360+x) = cos (1.360+30) + sec (1.360+210) = cos x + sec x = cos 30 + sec 210  = cos 30 + sec(180+30) = cos 30 + sec 30 = 1/2 akar 3 + 2/3 akar 3 = 1 1/2 akar 3
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