1) If the tangent to the function y=f(x) at (3,4) makes an angle of 3π4 with the positive directions of x-axis in anticlockwise direction then f '(3) is A) -1 B) 1 C) 1√3 D) √3 Answer: Option AExplanation:f′(3)=tan3π4=−tanπ4=−1
