Sách Toán – Học Toán – Đề Thi Toán https://booktoan.com Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online Wed, 16 Sep 2026 02:40:10 +0000 vi hourly 1 https://wordpress.org/?v=7.1.2 Rút gọn biểu thức lượng giác $P = \frac{\sin 7x – \sin 5x – \sin 3x + \sin x}{\cos 7x – \cos 5x – \cos 3x + \cos x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-7x-sin-5x-sin-3x-sin-xcos-7x-cos-5x-cos-3x-cos-x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-7x-sin-5x-sin-3x-sin-xcos-7x-cos-5x-cos-3x-cos-x.html#respond Wed, 16 Sep 2026 02:40:10 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-7x-sin-5x-sin-3x-sin-xcos-7x-cos-5x-cos-3x-cos-x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-7x-sin-5x-sin-3x-sin-xcos-7x-cos-5x-cos-3x-cos-x.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{\sin x + \sin 2x + \sin 3x + \sin 4x}{\cos x + \cos 2x + \cos 3x + \cos 4x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3x-sin-4xcos-x-cos-2x-cos-3x-cos-4x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3x-sin-4xcos-x-cos-2x-cos-3x-cos-4x.html#respond Wed, 16 Sep 2026 02:34:14 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3x-sin-4xcos-x-cos-2x-cos-3x-cos-4x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3x-sin-4xcos-x-cos-2x-cos-3x-cos-4x.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{\sin x + \sin 2x + \sin 3x}{\cos x + \cos 2x + \cos 3x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3xcos-x-cos-2x-cos-3x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3xcos-x-cos-2x-cos-3x.html#respond Wed, 16 Sep 2026 02:29:16 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3xcos-x-cos-2x-cos-3x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-2x-sin-3xcos-x-cos-2x-cos-3x.html/feed 0 Rút gọn biểu thức lượng giác $P = \frac{\sin x + \sin 3x + \sin 5x}{\cos x + \cos 3x + \cos 5x}$ https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-3x-sin-5xcos-x-cos-3x-cos-5x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-3x-sin-5xcos-x-cos-3x-cos-5x.html#respond Wed, 16 Sep 2026 02:24:14 +0000 https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-3x-sin-5xcos-x-cos-3x-cos-5x.html https://booktoan.com/rut-gon-bieu-thuc-luong-giac-p-fracsin-x-sin-3x-sin-5xcos-x-cos-3x-cos-5x.html/feed 0 Tính giá trị của biểu thức $P = \sin 10^\circ \sin 50^\circ \sin 70^\circ$ https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-10circ-sin-50circ-sin-70circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-10circ-sin-50circ-sin-70circ.html#respond Wed, 16 Sep 2026 02:05:15 +0000 https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-10circ-sin-50circ-sin-70circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-10circ-sin-50circ-sin-70circ.html/feed 0 Tính giá trị của biểu thức $P = \sin 20^\circ \sin 40^\circ \sin 80^\circ$ https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-20circ-sin-40circ-sin-80circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-20circ-sin-40circ-sin-80circ.html#respond Wed, 16 Sep 2026 01:29:05 +0000 https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-20circ-sin-40circ-sin-80circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-sin-20circ-sin-40circ-sin-80circ.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