1.sinXcosX+2sin^2x=cos^2X
2sin^2x- cos^2x + sinxcosx=0 (:cos^2x)
2(sin^2x/cos^2x) - 1 + ((sinxcosx)/cos^2x)=0
2tg^2x + tgx -1=0
D=b^2-4ac=1+8=9=3^2
tgx= (-1+3)/4,tgx=1-3/4
tgx=0,5 и tgx=-1 => x= arctg0,5 + piK; x=3pi/4 + piK.
2.
1.sinXcosX+2sin^2x=cos^2X
2sin^2x- cos^2x + sinxcosx=0 (:cos^2x)
2(sin^2x/cos^2x) - 1 + ((sinxcosx)/cos^2x)=0
2tg^2x + tgx -1=0
D=b^2-4ac=1+8=9=3^2
tgx= (-1+3)/4,tgx=1-3/4
tgx=0,5 и tgx=-1 => x= arctg0,5 + piK; x=3pi/4 + piK.
2.