N
ningue


giải giùm mình 2 pt
1. [TEX]sin^3x cos3x + cos^3x sin3x = sin^34x[/TEX]
2. [TEX]sin^3x + cos^3x = 1[/TEX]
1. [TEX]sin^3x cos3x + cos^3x sin3x = sin^34x[/TEX]
2. [TEX]sin^3x + cos^3x = 1[/TEX]