Cho góc xOy = 60°. Tia Ot là tia phân giác của góc xOy, tia Ot' là tia đối của tia Ot. Trên nửa mặt phẳng bờ tt' chứa tia Ox. Vẽ tia Oz sao cho góc t'Oz = 30°. CMR: Góc t'Oz và góc tOy là 2 góc đối đỉnh.

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