2 * 5ab - 3 * 2ab - 1 + 1 = 10ab - 6ab = 4ab
Sin2x - sinx = 2cosx - 1
<span>2sinx cosx - sinx = 2cosx - 1 </span>
<span>sinx(2cosx - 1)= 2cosx - 1 </span>
<span>sinx=1 </span>
<span>х=пи/2 + Пиэн</span>
(-4аб³)²=16а²б^6
б^6 - это б в 6 степени
(a-5x)/a :(ax-5xˇ2)/aˇ2=
=(a-5x)/a . aˇ2/x(a-5x)=
=a/x