Jawabanmu

2014-04-28T10:34:59+07:00
2014-04-28T10:43:42+07:00
4tanx = 4sinx/cosx Sinx= 0,6 cosx = 0,8 (pakai segitiga siku2) = 4sinx/cosx + 5cos^2x/cosx = (4sinx + 5(1-sin^2x))/cosx =(4sinx + 5 - 5sin^2)/cosx =(4(0,6) + 5 - 5(0,6)^2)/0,8 =(2,4+5-1,8)/0,8 =5,6/0,8 =7