Sách Toán – Học Toán – Đề Thi Toán https://booktoan.com Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online Thu, 22 Oct 2026 00:56:22 +0000 vi hourly 1 https://wordpress.org/?v=7.1.3 Tính giá trị của biểu thức $S = \sin 150^\circ + \cos 120^\circ – \tan 135^\circ$ https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-s-sin-150circ-cos-120circ-tan-135circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-s-sin-150circ-cos-120circ-tan-135circ.html#respond Thu, 22 Oct 2026 00:56:22 +0000 https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-s-sin-150circ-cos-120circ-tan-135circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-s-sin-150circ-cos-120circ-tan-135circ.html/feed 0 Cho góc $\alpha$ thỏa mãn $90^\circ < \alpha < 180^\circ$. Khẳng định nào sau đây là đúng? https://booktoan.com/cho-goc-alpha-thoa-man-90circ-alpha-180circ-khang-dinh-nao-sau-day-la-dung.html https://booktoan.com/cho-goc-alpha-thoa-man-90circ-alpha-180circ-khang-dinh-nao-sau-day-la-dung.html#respond Thu, 22 Oct 2026 00:51:50 +0000 https://booktoan.com/cho-goc-alpha-thoa-man-90circ-alpha-180circ-khang-dinh-nao-sau-day-la-dung.html https://booktoan.com/cho-goc-alpha-thoa-man-90circ-alpha-180circ-khang-dinh-nao-sau-day-la-dung.html/feed 0 Tính giá trị của biểu thức $P = \cos 0^\circ + \cos 40^\circ + \cos 120^\circ + \cos 140^\circ$ https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-0circ-cos-40circ-cos-120circ-cos-140circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-0circ-cos-40circ-cos-120circ-cos-140circ.html#respond Thu, 22 Oct 2026 00:46:57 +0000 https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-0circ-cos-40circ-cos-120circ-cos-140circ.html https://booktoan.com/tinh-gia-tri-cua-bieu-thuc-p-cos-0circ-cos-40circ-cos-120circ-cos-140circ.html/feed 0 Cho góc $\alpha$ ($0^\circ \le \alpha \le 180^\circ$) thỏa mãn $\sin \alpha + \cos \alpha = \frac{\sqrt{2}}{2}$. Tính giá trị của biểu thức $P = \sin^3 \alpha + \cos^3 \alpha$ https://booktoan.com/cho-goc-alpha-0circ-le-alpha-le-180circ-thoa-man-sin-alpha-cos-alpha-fracsqrt22-tinh-gia-tri-cua-bieu-thuc-p-sin3-alpha-cos3-alpha.html https://booktoan.com/cho-goc-alpha-0circ-le-alpha-le-180circ-thoa-man-sin-alpha-cos-alpha-fracsqrt22-tinh-gia-tri-cua-bieu-thuc-p-sin3-alpha-cos3-alpha.html#respond Thu, 22 Oct 2026 00:38:46 +0000 https://booktoan.com/cho-goc-alpha-0circ-le-alpha-le-180circ-thoa-man-sin-alpha-cos-alpha-fracsqrt22-tinh-gia-tri-cua-bieu-thuc-p-sin3-alpha-cos3-alpha.html https://booktoan.com/cho-goc-alpha-0circ-le-alpha-le-180circ-thoa-man-sin-alpha-cos-alpha-fracsqrt22-tinh-gia-tri-cua-bieu-thuc-p-sin3-alpha-cos3-alpha.html/feed 0