2∫_0 ^(2tan^(−1) (R/((a−R)(√2)))) (√((1(sin α+(√2))tan α)^2 +(1+(√(1^2 −((√2)tan α(5−2)−1)^2 ))cot (((((3π)/4)−sin^(−1) ((√(1^2 −((√2)tan α(5−1)−1)^2 ))/((5−1)(√2))))/2))−(1−(√(1^2 −((√2)tan α(5−1)−1)^2 )))tan ((π/4)−sin^(−1) ((√(1^2 −((√2)tan α(5−1)−1)^2 ))/((5−1)(√2)))))^2 ))×((5(√2))/((cos α)^2 ))dα