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`tan [(1)/(2) sin^(-1)""(2x)/(1+x^(2))+(1)/(2) cos ^(-1)""(1-y^(2))/(1+y^(2))], xy ne 1`
`tan [(1)/(2) sin^(-1)""(2x)/(1+x^(2))+(1)/(2) cos ^(-1)""(1-y^(2))/(1+y^(2))], xy ne 1`
แสดงข้อมูลเพิ่มเติม 1
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