Ответ:
9,4x-7,8x+0,52=1
1,6х=1-0,52
1,6х=0,48
x=0.48/1.6
х=0,3
sin41=sin(90-49)=cos49
sin98=sin(2*49)=2sin49cos49
5sin98/sin49sin41=10sin49cos49/sin49cos49