Math Chapter Wise Limit, Continuity And Differentiability Of Function Of One Variable English MCQ TGT 2005 Q.If tan 2 1 2 1 x y 1 x − = + then dy dx is equal to: A4 1 (1) x + B4 2 (1) x − + C4 –1 (1) x + DNone of these Show answer Correct answer: 4 2 (1) x − +