1.

\( \operatorname{Lt}_{x \rightarrow \frac{\pi}{4}} \frac{f(x)-f\left(\frac{\pi}{4}\right)}{x-\frac{\pi}{4}} \)

Answer»

It is in the 0/0 form 

By L-Hospital rule differentiate numerator and denominator

Lt x → π/4    0 - f'(π/4) / 1 - 0

 -f'(π/4)



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