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If the tangent to the function $y=f(x)$ at $(3,4)$ makes an angle of $\frac{3 \pi}{4}$ with the positive direction of $x$-axis in anticlockwise direction then $f^{\prime}(3)$ is
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$-1$
$f^{\prime}(3)=\tan \frac{3 \pi}{4}=-\tan \frac{\pi}{4}=-1$
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