đồ thị các hàm LG cơ bản

-5π/2 -2π -3π/2 -π -π/2 π/2 π 3π/2 2π 5π/2 3π -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 x f(x) y = sin x -5π/2 -2π -3π/2 -π -π/2 π/2 π 3π/2 2π 5π/2 3π -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 x f(x) y=cosx -5π/2 -2π -3π/2 -π -π/2 π/2 π 3π/2 2π 5π/2 3π -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 x f(x) y= tanx -3π -5π/2 -2π -3π/2 -π -π/2 π/2 π 3π/2 2π 5π/2 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 x f(x) y=cotx