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Mathematics
Problem
Evaluate:
lim
x
→
π
2
2
−
cos
x
−
1
(
x
−
π
2
)
\lim_{x \to \frac{\pi}{2}} \frac{2^{-\cos x} - 1}{\left(x - \frac{\pi}{2}\right)}
x
→
2
π
lim
(
x
−
2
π
)
2
−
c
o
s
x
−
1
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