Sin pí/6=1/2
sin pí/3= V3/2
sin 2pí/3=V3/2
sin 4pí/3=-V3/2
<span>16.1/2.V3/2.V3/2.(-V3/2)=8.3/4.(-(V3/2)=- 6.(V3/2)=-3.V3</span>
<span>3a+ax-3b+3c-bx+cx=3(а+с-в)+х(а+с-в)=(а+с-в)(3+х)</span>
<span> ax+2y=11
а*7+2*5=11
7а+10=11
7а=1
а=1/7</span>
8<em>х</em>³+27у³-8х³-27у³=0
64а³-х³-64а³+х³=0