1) If the tangent to the function y=f(x) at (3,4) makes an angle of $\frac{3\pi}{4}$ with the positive directions of x-axis in anticlockwise direction then f '(3) is A) -1 B) 1 C) $\frac{1}{\sqrt{3}}$ D) $\sqrt{3}$ Answer: Option AExplanation:$f'(3)= \tan \frac{3\pi}{4}=-\tan \frac{\pi}{4}=-1$
