T tran1995 New member Xu 0 30/7/12 #2 dieu kien 3(cotx-cosx+1)-5(tanx-sinx+1)=0 Nho khai bieu thuc trong ngoac thi xuat hien nhan tu chung chuc em may man anh giai den day thuj
dieu kien 3(cotx-cosx+1)-5(tanx-sinx+1)=0 Nho khai bieu thuc trong ngoac thi xuat hien nhan tu chung chuc em may man anh giai den day thuj