⑩串紫学 Teaching Plan on Advanced Mathematics 在积分表(六)中查得公式(37) d x n +c 2 xx+aaa+√x+a 儿 n +c n√n2+3233+√u2+32 将L=2x代入得 dx 2|x n +C, x√4x2+933+√4x2+9Tianjin Polytechnic University Teaching Plan on Advanced Mathematics 在积分表(六)中查得公式(37) + 2 2 x x a dx C a x a x a + + + = 2 2 | | ln 1 + 2 2 u u 3 du C u u + + + = 2 2 3 3 | | ln 3 1 将 u = 2x 代入得 4 + 9 2 x x dx . 3 4 9 2 | | ln 3 1 2 C x x + + + =