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 01:39:54 +0000 vi hourly 1 https://wordpress.org/?v=7.1.2 Ứng dụng phương trình lượng giác: Tìm thời điểm công suất tiêu thụ điện đạt $110\text{ kW}$ trong ngày $P(t) = 100 + 10\sin\left(\frac{\pi}{12}t\right)$ https://booktoan.com/ung-dung-phuong-trinh-luong-giac-tim-thoi-diem-cong-suat-tieu-thu-dien-dat-110text-kw-trong-ngay-pt-100-10sinleftfracpi12tright.html https://booktoan.com/ung-dung-phuong-trinh-luong-giac-tim-thoi-diem-cong-suat-tieu-thu-dien-dat-110text-kw-trong-ngay-pt-100-10sinleftfracpi12tright.html#respond Sun, 04 Oct 2026 01:39:54 +0000 https://booktoan.com/ung-dung-phuong-trinh-luong-giac-tim-thoi-diem-cong-suat-tieu-thu-dien-dat-110text-kw-trong-ngay-pt-100-10sinleftfracpi12tright.html https://booktoan.com/ung-dung-phuong-trinh-luong-giac-tim-thoi-diem-cong-suat-tieu-thu-dien-dat-110text-kw-trong-ngay-pt-100-10sinleftfracpi12tright.html/feed 0 Giải phương trình lượng giác $\cos(3x – 45^\circ) = \frac{\sqrt{2}}{2}$ và các mệnh đề liên quan https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html#respond Sun, 04 Oct 2026 01:29:53 +0000 https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html/feed 0 Giải phương trình lượng giác $\sin(3x – 15^\circ) = -\frac{\sqrt{3}}{2}$ https://booktoan.com/giai-phuong-trinh-luong-giac-sin3x-15circ-fracsqrt32.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin3x-15circ-fracsqrt32.html#respond Sun, 04 Oct 2026 01:27:01 +0000 https://booktoan.com/giai-phuong-trinh-luong-giac-sin3x-15circ-fracsqrt32.html https://booktoan.com/giai-phuong-trinh-luong-giac-sin3x-15circ-fracsqrt32.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 Hàm số $y = \cos x$ nghịch biến trên khoảng nào dưới đây? https://booktoan.com/ham-so-y-cos-x-nghich-bien-tren-khoang-nao-duoi-day.html https://booktoan.com/ham-so-y-cos-x-nghich-bien-tren-khoang-nao-duoi-day.html#respond Tue, 22 Sep 2026 08:09:32 +0000 https://booktoan.com/ham-so-y-cos-x-nghich-bien-tren-khoang-nao-duoi-day.html https://booktoan.com/ham-so-y-cos-x-nghich-bien-tren-khoang-nao-duoi-day.html/feed 0 Tìm các khoảng đồng biến và nghịch biến của hàm số $y = \sin x$ trên đoạn $[0; 2\pi]$ https://booktoan.com/tim-cac-khoang-dong-bien-va-nghich-bien-cua-ham-so-y-sin-x-tren-doan-0-2pi.html https://booktoan.com/tim-cac-khoang-dong-bien-va-nghich-bien-cua-ham-so-y-sin-x-tren-doan-0-2pi.html#respond Tue, 22 Sep 2026 08:03:38 +0000 https://booktoan.com/tim-cac-khoang-dong-bien-va-nghich-bien-cua-ham-so-y-sin-x-tren-doan-0-2pi.html https://booktoan.com/tim-cac-khoang-dong-bien-va-nghich-bien-cua-ham-so-y-sin-x-tren-doan-0-2pi.html/feed 0 Hàm số $y = \sin x$ đồng biến trên khoảng nào dưới đây? https://booktoan.com/ham-so-y-sin-x-dong-bien-tren-khoang-nao-duoi-day.html https://booktoan.com/ham-so-y-sin-x-dong-bien-tren-khoang-nao-duoi-day.html#respond Tue, 22 Sep 2026 07:58:08 +0000 https://booktoan.com/ham-so-y-sin-x-dong-bien-tren-khoang-nao-duoi-day.html https://booktoan.com/ham-so-y-sin-x-dong-bien-tren-khoang-nao-duoi-day.html/feed 0 Tìm chu kì tuần hoàn của hàm số $y = \cot\left(\frac{x}{3} – \frac{\pi}{6}\right)$ https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-cotleftfracx3-fracpi6right.html https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-cotleftfracx3-fracpi6right.html#respond Tue, 22 Sep 2026 03:32:41 +0000 https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-cotleftfracx3-fracpi6right.html https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-cotleftfracx3-fracpi6right.html/feed 0 Tìm chu kì tuần hoàn của hàm số $y = \tan\left(2x + \frac{\pi}{4}\right)$ https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-tanleft2x-fracpi4right.html https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-tanleft2x-fracpi4right.html#respond Tue, 22 Sep 2026 03:26:30 +0000 https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-tanleft2x-fracpi4right.html https://booktoan.com/tim-chu-ki-tuan-hoan-cua-ham-so-y-tanleft2x-fracpi4right.html/feed 0