∫x^2sin(4x)dx 怎么算啊

∫x^2sin(4x)dx 怎么算啊 ∫x^2 sin(x^2) dx怎么算 . ∫sin(x^2)dx 这个怎么算的? ∫ 4/sin^2x dx ∫x/(sin²x)dx的不定积分怎么算 ∫x/sin^2(x) dx ∫sin(x) cos^2(x)dx ∫[(1-sin(2x))/(sin^2(x)-x)]dx 怎么解 ∫（sin√x）dx 不定积分怎么求啊, ∫sin^2 2x dx的积分怎么求 ∫sin[(x)^(1/2)]dx怎么做, ∫dx/cos^2X+4sin^2X 求微积分 ∫sin^2(x)cos^4(x) dx 用换元法计算不定积分∫x sin[(x^2)+4] dx ∫[1/(sin^2(x)cos^4(x)]dx 求解∫1/(cos^4(x)sin^2(x))dx ∫sin（6x）sin（4x）dx ∫sin^2x/(1+sin^2x )dx求解,