/ ___\ ___ atan\\/ x / - \/ x
atan(sqrt(x)) - sqrt(x)
1 1 - ------- + --------------- ___ ___ 2*\/ x 2*\/ x *(1 + x)
1 2 1 - - -------- - --------- x 2 x*(1 + x) (1 + x) ------------------------ ___ 4*\/ x
1 3 1 3 -------- - ---- + ------------ + ------------ 3 2 2 2 (1 + x) 8*x 2*x*(1 + x) 8*x *(1 + x) --------------------------------------------- ___ \/ x