计算∫-π/2π/2(cosx/(2+sinx)+x2sinx)dx.

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问题 计算∫-π/2π/2(cosx/(2+sinx)+x2sinx)dx.

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答案-π/2π/2[cosx/(2+sinx)+x2sinx]dx=∫-π/2π/2cosx/(2+sinx)dx=∫0π/2[cosx/(2+sinx)+cosx/(2-sinx)]dx=4∫0π/2cosx/(4-sin2x)dx=-4∫0π/2d(sinx)/(sin2x-4)=-ln|(sinx-2)/(sinx+2)|0π/2=ln3.

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