<span>sin x /3 * cos п / 5- cos x / 3 * sin п / 5=корень из 2 / 2</span>
<span>sin(x/3-pi/5)=V2/2</span>
<span>x/3-pi/5=(-1)^n*pi/4+pi n</span>
<span>x/3=pi/5+(-1)^n*pi/4+pi n</span>
<span>x=3pi/5+(-1)^n*3pi/4+3pi n</span>
<span><span>sin^2 x/4 - cos^2 x/4=1</span></span>
<span><span>cos2x/4=-1</span></span>
<span><span>x/2=pi+2pi n</span></span>
<span><span>x=2pi+4pi n</span></span>