√1000以上 x^2-y^2 2x 1 154054-(x^2+y^2-1)^3

 Evaluating ∫ 0 π 2 (1 log ⁡ (tan ⁡ x) 1 1 − tan ⁡ (x)) 3 d x Using the method shown here, I have found the following closed form ∫ 0 π 2 (1 log ⁡ (tan ⁡ x) 1 1 − tan ⁡ x) 2 d x = 3 ln ⁡ 2 − 4 π