solve cosx = 2/7 for x [Pie , 2Pie]
My solution is first : Arc cos ==> 1.28 rd , 1.28/3.14 = 0.4076 Pie its not in the domain so what to do ? I don't know what to do after that ? please can you help me ?
oh thanks yeah sorry ''PI'' . 1.28/pi to get the result is PI ? coz its in Radian .
anway how to find n ? I need an exemple how to resolve this problem .
our teacher is drawing the circle and i m lost sometimes she adjust -Pi -x , +Pi + x Please can you help me how to know ?