ot4aqna_________
04-19-2007, 06:42
Molq vi daite re6enie na tezi zada4i do edin 4as
3sin^2.x-4sinx.cosx+5cos^2.x=2^2
3sin2x+2cos2x=3
sinx-cosx=2sin^2.x/2
cos2x+4cosx-5=0
cosx+2=4cos^2.x/2
tg2x+cotg^2.x=2
sinx+2cosX=-2
2sin^3.x+4cos^3.x-3sin=0
sin2x-2sin^2.x=2cos^2.x
3sin^2.x-4sinx.cosx+5cos^2.x=2^2
3sin2x+2cos2x=3
sinx-cosx=2sin^2.x/2
cos2x+4cosx-5=0
cosx+2=4cos^2.x/2
tg2x+cotg^2.x=2
sinx+2cosX=-2
2sin^3.x+4cos^3.x-3sin=0
sin2x-2sin^2.x=2cos^2.x