Evaluate the following limits : \[ \operatorname{Lt}_{x \rightarrow \frac{\pi}{4}} \frac{\sin ^{...

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Evaluate the following limits :
\[
\operatorname{Lt}_{x \rightarrow \frac{\pi}{4}} \frac{\sin ^{3} x-\cos ^{3} x}{x-\frac{\pi}{4}}
\]
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