Sách Toán – Học Toán – Đề Thi Toán https://booktoan.com Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online Sun, 04 Oct 2026 01:35:53 +0000 vi hourly 1 https://wordpress.org/?v=7.1.2 Giải phương trình lượng giác $\sin(2x – \frac{\pi}{4}) = \sin(x + \frac{\pi}{3})$ https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi4-sinx-fracpi3.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi4-sinx-fracpi3.html#respond Sun, 04 Oct 2026 01:35:53 +0000 https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi4-sinx-fracpi3.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi4-sinx-fracpi3.html/feed 0 Giải phương trình lượng giác $\sin(2x + \frac{\pi}{3}) = \frac{1}{2}$ trong khoảng $(0; \pi)$ https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi3-frac12-trong-khoang-0-pi.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi3-frac12-trong-khoang-0-pi.html#respond Sun, 04 Oct 2026 01:25:02 +0000 https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi3-frac12-trong-khoang-0-pi.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin2x-fracpi3-frac12-trong-khoang-0-pi.html/feed 0 Giải phương trình lượng giác $\sin x + \cos x = \sqrt{2}\sin 5x$ https://booktoan.com/giai-phuong-trinh-luong-giac-sin-x-cos-x-sqrt2sin-5x.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin-x-cos-x-sqrt2sin-5x.html#respond Sun, 04 Oct 2026 01:15:29 +0000 https://booktoan.com/giai-phuong-trinh-luong-giac-sin-x-cos-x-sqrt2sin-5x.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin-x-cos-x-sqrt2sin-5x.html/feed 0