求不定积分 ∫xdx/sin^2x 求不定积分 ∫xdx/(sin^2)x

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求不定积分∫xdx/sin^2x求不定积分∫xdx/(sin^2)x求不定积分∫xdx/sin^2x求不定积分∫xdx/(sin^2)x求不定积分∫xdx/sin^2x求不定积分∫xdx/(sin^2

求不定积分 ∫xdx/sin^2x 求不定积分 ∫xdx/(sin^2)x
求不定积分 ∫xdx/sin^2x
求不定积分 ∫xdx/(sin^2)x

求不定积分 ∫xdx/sin^2x 求不定积分 ∫xdx/(sin^2)x
∫[x/(sinx)^2] dx
=-∫ x d(cotx)
=-xcotx + ∫ cotx dx
= -xcotx +ln|sinx| + C