Math Chapter Wise Tangent, Normal, Increasing, Decreasing And Maxima/Minima Of A Function Of One Variable English MCQ PGT 2011 Q.The derivative of 1 2 1 sec 2x 1 − with respect to 2 1 x − − at 1 x 2 = is: A2 B4 C3 D–2 Show answer Correct answer: 4