how to calculate this limit ?

how to find the limit ?
View attachment 19404
for you problem, substitute:

\(\displaystyle \frac{\pi}{2^{x+2}} = u \)

What would be the answer to following:

\(\displaystyle \lim_{t\to 0}\frac{sin(t)}{t}\)

Please show us what you have tried and exactly where you are stuck.

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