On convexity and power series expansion for logarithm of normalized tail of power series expansion for square of tangent

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• Gui-Zhi Zhang
• Feng Qi

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• Primary
• 41A58
• Secondary
• 26A06
• 26A09
• 26A48
• 26A51
• 33B10

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• Maclaurin power series expansion
• normalized tail
• tangent
• square
• logarithm
• convexity
• monotonicity rule
• derivative formula
• ratio

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