N
nguyet_baby_cute


bai 1:
5 .(sinx+(cos3x+sin3x)/1+2sin2x)=3+cos2x (x thuộc (0;2pi))
bài 2:
3cos4x-2cos^2 3x=1
bài 3:
2sin^2.(x-pi/4)=2sin^2x - tanx
bài 4: (1+2sinx)^2 .cosx=1+sinx+cosx

5 .(sinx+(cos3x+sin3x)/1+2sin2x)=3+cos2x (x thuộc (0;2pi))
bài 2:
3cos4x-2cos^2 3x=1
bài 3:
2sin^2.(x-pi/4)=2sin^2x - tanx
bài 4: (1+2sinx)^2 .cosx=1+sinx+cosx
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