122210ddd+Cdln1ddarctanarccotarcsinarccos11dsindcoscosdsinsecosnnxxCkxxCxxxxCnxxxcxcxCxCxxxxxCxxxCx222cdtandcsccotsectandseccotdcscsindddln|cos|lncotdln|sin|csctansecdxxxxexxxCxxxCxxxxCxxxxCxaaxCxeCxxCaxxxCxxx22222222222222ln|sectan|d1cscdln|csccot|arctand1dln||arcsin2ddln()ln||xxCxxxxxxCCaxaaxxaxxCCxaaxaaaxxxxxaCxxaCxaxa