3. x = sin 50° - tan 140°; y = cos 140° sin 200° sin 30° z = cos 300°•cot 200°; t = cot 190° olduğuna göre x, y, z ve t'nin işaretleri sırasıyla aşağıdakilerden hangisidir? A)-, +, -, - B) +, +, +, - D) -, +, -, + C) +, +, +, + E) -, +, +, +
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