Kiểm tra 45 phút môn Toán

Kiểm tra 45p Họ và tờn: Lớp: Đề bài: I, Trắc nghiệm khách quan: (2đ) Khoanh tròn vào đáp án đúng trong mỗi câu sau đây: Câu 1: Số đo của cung 4025’ ra rađian, với độ chính xác đến 0,0001 là: (A) 4025’ ≈ 0,7054 (B) 4025’ ≈ 0,0546 (C) 4025’ ≈ - 0,7050 (D) 4025’ ≈ - 0,7054 Câu 2: Giá trị của là: (A) (B) (C) (D) II, Tự luận: ( 8đ ) Bài 1: (2,5 đ ) Tính giá trị lượng giác của góc a : sina, tana, sin2a, cos2a Biết: cosa = và p/2 < a < p . Bài 2:(3,0 đ ) Tính: ( Không dùng máy tính và bảng lượng giác.) a, b, + + Bài 3: (2,5 đ ) Chứng minh biểu thức: = 2 Bài làm: 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