N
nghiemthihoa
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GIAI PT LUONG GIAC SAU
1, sin^2 x + 1/4 sin^2 2x = sinx.sin^2 3x
2, 2cosx + 3^(1/2).cos10x = 3.2^(1/2) + 2.cos8x.sinx
1, sin^2 x + 1/4 sin^2 2x = sinx.sin^2 3x
2, 2cosx + 3^(1/2).cos10x = 3.2^(1/2) + 2.cos8x.sinx