26. If the normal to the curve $y = f ( x )$ at the point ( 3,4 ) makes an angle $3 p / 4$ with the positive $x$-axis then $\mathrm { f } ^ { \prime } ( 3 ) =$ (A) - 1 (B) $- 3 / 4$ (C) $4 / 3$ (D) 1
26. If the normal to the curve $y = f ( x )$ at the point ( 3,4 ) makes an angle $3 p / 4$ with the positive $x$-axis then $\mathrm { f } ^ { \prime } ( 3 ) =$\\
(A) - 1\\
(B) $- 3 / 4$\\
(C) $4 / 3$\\
(D) 1\\