Sách Toán – Học Toán – Đề Thi Toán https://booktoan.com Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online Mon, 21 Sep 2026 13:00:58 +0000 vi hourly 1 https://wordpress.org/?v=7.1.2 Tìm tập xác định của hàm số $y = \frac{\sqrt{3} – \tan x}{\sin 2x + \cos x}$ https://booktoan.com/tim-tap-xac-dinh-cua-ham-so-y-fracsqrt3-tan-xsin-2x-cos-x.html https://booktoan.com/tim-tap-xac-dinh-cua-ham-so-y-fracsqrt3-tan-xsin-2x-cos-x.html#respond Mon, 21 Sep 2026 13:00:58 +0000 https://booktoan.com/tim-tap-xac-dinh-cua-ham-so-y-fracsqrt3-tan-xsin-2x-cos-x.html https://booktoan.com/tim-tap-xac-dinh-cua-ham-so-y-fracsqrt3-tan-xsin-2x-cos-x.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{\sin 4x – \sin 2x}{1 – \cos 2x + \cos 4x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-sin-2x1-cos-2x-cos-4x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-sin-2x1-cos-2x-cos-4x.html#respond Wed, 16 Sep 2026 01:28:11 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-sin-2x1-cos-2x-cos-4x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-sin-2x1-cos-2x-cos-4x.html/feed 0 Tính giá trị của biểu thức lượng giác $P = \frac{1}{\sin 10^\circ} – \frac{\sqrt{3}}{\cos 10^\circ}$ https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-luong-giac-p-frac1sin-10circ-fracsqrt3cos-10circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-luong-giac-p-frac1sin-10circ-fracsqrt3cos-10circ.html#respond Wed, 16 Sep 2026 01:23:09 +0000 https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-luong-giac-p-frac1sin-10circ-fracsqrt3cos-10circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-luong-giac-p-frac1sin-10circ-fracsqrt3cos-10circ.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{\cos 2x}{\cot x – \tan x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fraccos-2xcot-x-tan-x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fraccos-2xcot-x-tan-x.html#respond Wed, 16 Sep 2026 01:18:10 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fraccos-2xcot-x-tan-x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fraccos-2xcot-x-tan-x.html/feed 0 Tính giá trị của biểu thức $P = \cos \frac{\pi}{7} \cos \frac{2\pi}{7} \cos \frac{4\pi}{7}$ https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-fracpi7-cos-frac2pi7-cos-frac4pi7.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-fracpi7-cos-frac2pi7-cos-frac4pi7.html#respond Wed, 16 Sep 2026 01:13:10 +0000 https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-fracpi7-cos-frac2pi7-cos-frac4pi7.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-fracpi7-cos-frac2pi7-cos-frac4pi7.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{\sin 2x + \sin x}{1 + \cos 2x + \cos x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-2x-sin-x1-cos-2x-cos-x-2.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-2x-sin-x1-cos-2x-cos-x-2.html#respond Wed, 16 Sep 2026 01:07:10 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-2x-sin-x1-cos-2x-cos-x-2.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-2x-sin-x1-cos-2x-cos-x-2.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{\sin 4x – 2\sin 2x}{\sin 4x + 2\sin 2x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-2sin-2xsin-4x-2sin-2x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-2sin-2xsin-4x-2sin-2x.html#respond Wed, 16 Sep 2026 01:01:11 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-2sin-2xsin-4x-2sin-2x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-4x-2sin-2xsin-4x-2sin-2x.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{1 + \sin 2x – \cos 2x}{1 + \sin 2x + \cos 2x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x-2.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x-2.html#respond Wed, 16 Sep 2026 00:56:09 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x-2.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x-2.html/feed 0 Cho $\sin \alpha = \frac{3}{5}$ với $\frac{\pi}{2} < \alpha < \pi$. Tính giá trị của biểu thức $P = \frac{\sin 2\alpha - 3\cos 2\alpha}{1 + \tan 2\alpha}$ https://booktoan.com/cho-sin-alpha-frac35-voi-fracpi2-alpha-pi-tinh-gia-tri-cua-bieu-thuc-p-fracsin-2alpha-3cos-2alpha1-tan-2alpha.html https://booktoan.com/cho-sin-alpha-frac35-voi-fracpi2-alpha-pi-tinh-gia-tri-cua-bieu-thuc-p-fracsin-2alpha-3cos-2alpha1-tan-2alpha.html#respond Wed, 16 Sep 2026 00:50:50 +0000 https://booktoan.com/cho-sin-alpha-frac35-voi-fracpi2-alpha-pi-tinh-gia-tri-cua-bieu-thuc-p-fracsin-2alpha-3cos-2alpha1-tan-2alpha.html https://booktoan.com/cho-sin-alpha-frac35-voi-fracpi2-alpha-pi-tinh-gia-tri-cua-bieu-thuc-p-fracsin-2alpha-3cos-2alpha1-tan-2alpha.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{1 + \sin 2x – \cos 2x}{1 + \sin 2x + \cos 2x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x.html#respond Wed, 09 Sep 2026 15:40:35 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-frac1-sin-2x-cos-2x1-sin-2x-cos-2x.html/feed 0