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如何求出sinx_(sinx-cosx)的不定积分的表达式?

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如何求出sinx_(sinx-cosx)的不定积分的表达式? JPEG Origin Image Download
https://www.youtube.com/watch?v=82EBr19blL8
光是套用固定模板公式是解不了的,需要灵活变通......
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