If the normal to the curve \( y=f(x) \) at the point \( (3,4) \) makes an angle \( \frac{{ }^{\p....

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If the normal to the curve \( y=f(x) \) at the point \( (3,4) \)
\( \mathrm{P} \)
makes an angle \( \frac{{ }^{\prime} \pi}{4} \) with the positive \( x \)-axis, then \( f^{\prime}(3)= \)
(1) 1
(2) -1
(3) \( \frac{-3}{4} \)
(4) \( \frac{4}{3} \)


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