Show that f(x)= (2 x+ 4 ) is an increasing function on (3 8 , 7 8… - Vidyadip

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Show that $f(x)=\cos \left(2 x+\frac{\pi}{4}\right)$ is an increasing function on $\left(\frac{3 \pi}{8}, \frac{7 \pi}{8}\right)$

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