3.1171)tgx=a3a2+10a+3=0D=100-36=64a1=(-10-8)/6=-3⇒tgx=-3⇒x=-arctg3+πna2=(-10+8)/6=-1/3⇒tgx=-1/3⇒x=-arctg1/3+πn4)ctg2x-(1-√3)ctg2x+√3-6=0ctg2x=aa²-(1-√3)a+√3-6=0D=(1-√3)²-4(√3-6)=1-2√3+3-4√3+24=28-6√3a1=(1-√3-√(28-6√3)/2⇒ctg2x=(1-√3-√(28-6√3)/2⇒x=1/2arcctg(1-√3-√(28-6√3)+πn/2a2=(1-√3+√(28-6√3)/2⇒ctg2x=(1-√3+√(28-6√3)/2⇒x=1/2arcctg(1-√3+√(28-6√3)+πn/23.1202)4-4sin²x-sinx-1=04sin²x+sinx-3=0sinx=a4a²+a-3=0D=1+48=49a1=(-1-7)/8=-1⇒sinx=-1⇒x=-π/2+2πna2=(-1+7)/8=3/4=0,75⇒sinx=0,75⇒x=(-1)^n*arcsin0,75+2πn