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Problem
Problem
Evaluate
lim
x
→
0
x
tan
2
x
−
2
x
(
1
−
cos
2
x
)
\lim_{x\to 0} \frac{x \tan 2x - 2x}{(1-\cos 2x)}
x
→
0
lim
(
1
−
cos
2
x
)
x
tan
2
x
−
2
x
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