<span>3,7n-2,8n+4,9n-n=4,8n</span>
<span>4,8*24=115,2</span>
<span>4,8*10=48</span>
<span>4,8*100=480</span>
при п=24 4,8*24=115,2
при п=10 4,8*10=48
при п=100 4,8*100=480
2*(cos(a)*cos(a)) - 1 = 2*(0.4*0.4) - 1 = -0,68