Giải phương trình:
$\sin x +\cos x.\sin2x -\sqrt{3}\cos3x=2(\cos5x+\sin^3x)$ 
Bạn xem ở đây nhá.
http://toan.hoctainha.vn/Hoi-Dap/Cau-Hoi/113625/ai-giu-p-minh-lam-bai-nay-voi-nha 
Bạn nên dùng chức năng tìm kiếm trước khi đặt câu hỏi. 
một thư viện nhiều bài quá –  hoangtuchuayeu_hp 03-10-12 09:04 PM
hay thật đấy. –  Long Trần 03-10-12 03:23 PM
Trang hoctainha.vn có nhiều bài toán hay trong thư viện quá ! –  dominhduc9x 03-10-12 11:22 AM

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