求解一道高数极限题lim[tan(x+h)-2tanx+tan(x-h)]/h² h→0 答案为2sec
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lim[tan(π/3+h)-tan(π/3-h)]/h h→0求极限
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lim (x→0) [(2x) / (1+x^2)]/sec x tan x+si
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