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This is a Korean CSAT mathematics multiple-choice problem. Solve it and put only the correct choice symbol, one of ①, ②, ③, ④, ⑤, inside \boxed{}.
Problem 23 Evaluate lim x→0 tan 6x 2x . [2 points] ①1 ②2 ③3 ④4 ⑤5
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로그인 회원가입 You are solving a Korean CSAT mathematics problem. Reason carefully, but the final response must contain exactly one final answer inside \boxed{}.
For multiple-choice problems, put only one of ①, ②, ③, ④, ⑤ inside \boxed{}. For short-answer problems, put only the final integer inside \boxed{}. Do not use external tools.
Problem 23 Evaluate lim x→0 tan 6x 2x . [2 points] ①1 ②2 ③3 ④4 ⑤5 더보기
We evaluate the limit:
lim 𝑥 → 0 tan 6 𝑥 2 𝑥 x→0 lim
2x tan6x
Using the standard limit lim 𝑢 → 0 tan 𝑢 𝑢
1 lim u→0
u tanu
=1, we rewrite:
tan 6 𝑥 2 𝑥
tan 6 𝑥 6 𝑥 ⋅ 6 𝑥 2 𝑥
tan 6 𝑥 6 𝑥 ⋅ 3 2x tan6x
= 6x tan6x
⋅ 2x 6x
= 6x tan6x
⋅3
As 𝑥 → 0 x→0, 6 𝑥 → 0 6x→0, so tan 6 𝑥 6 𝑥 → 1 6x tan6x
→1. Therefore the limit is 1 ⋅ 3
3 1⋅3=3.
The correct choice is ③.
\boxed{③}
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Comparative Analysis (P30) (Average across runs)
Averages use reported measurements only. Missing usage is not treated as zero.