A tangent is drawn to parabola $y^2=8x$ which makes angle $\theta$ with positive direction of x-axis. The equation of tangent is (A) $y=x\tan \theta +2\cot \theta$ (B) $y\cot \theta =x-2\tan \theta$ (C) $y\cot \theta =x+2\tan \theta$ (D) $y\cot \theta =x-\tan \theta$

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