1
(sinx-1)*tgx-3(sinx-1)=0
(sinx-1)(tgx-3)=0
sinx=1⇒x=π/2+2πk,k∈z
tgx=3⇒x=arctg3+πn,n∈z
2
(1-cos6x)*cos20x-(1-cos6x)/2=0
2(1-cos6x)*cos20x-(1-cos6x)=0
(1-cos6x)(2cos20x-1)=0
cos6x=1⇒6x=π/2+2πn⇒x=π/12+πn/3,n∈z
cos20x=1/2⇒20x=+-π/3+2πk⇒x=+-π/60+πk/10,k∈z