2.求下列不定积分:-|||-(1) int (sin 2x-(e)^dfrac (x{3)})dx =-|||-(2) int ((2x+3))^99dx =-|||-(3) int dfrac (1-x)(sqrt {9-{x)^2}}dx :-|||-(4) int (e)^-xcos ((e)^-x)dx;-|||-(5) int dfrac (x)(sqrt [3]{2{x)^2+1}}dx :-|||-(6) int (x)^2(e)^-3(x^3+5)dx =-|||-(7) int dfrac (tan sqrt {x)}(sqrt {x)}dx =-|||-(8) int dfrac (1)(sqrt {x)sqrt (1-sqrt {x)}}dx =-|||-(9) int dfrac (ln x)(x({ln )^2x-1)}dx =-|||-(10) int dfrac (x)({sin )^2((x)^2+1)}dx :-|||-(11) int dfrac (1)(1+{e)^-x}dx =-|||-(12) int dfrac (1)({e)^x-(e)^-x}dx =-|||-(13) [tan^5xsec^3xdx;-|||-(14) int dfrac (1)(1+sin x)dx =-|||-(15) int dfrac (1)({x)^2+5x+6}dx =-|||-(16) int dfrac (x)({x)^2+3x+2}dx :-|||-(17) int dfrac (1)({x)^2+2x+3}dx =-|||-(18) int dfrac (1)(sqrt {1+x-{x)^2}}dx -