∫-π/4π/4dx/(1-sinx)=________.

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问题-π/4π/4dx/(1-sinx)=________.

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答案2

解析-π/4π/4dx/(1-sinx)=∫0π/4(1/(1-sinx)+1/(1+sinx))dx=∫0π/42/(1-sin2x)dx=2∫0π/4sec2xdx=2tanx|0π/4=2.
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