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I wonder how to calculate the underlined part at the end of the high number help?
t？ =arctan(4/3), then TANT = 4/3; sect=5/3，csct = 5/4；

t？ =arctan(3/4), then TANT = 3/4; sect=5/4，csct = 5/3；

t？ Is the upper limit, t? Is the lower limit

∴[ln∣sect+tant∣-csct]∣<； Arctangent (4/3), arctangent (3/4) >

=[ln∣(5/3)+(4/3)∣-(5/4)]-[ln∣(5/4)+(3/4)∣-(5/3)]

=[ln3-(5/4)]-[LN2-(5/3)]= ln(3/2)+5/ 12；

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