求不定积分,sin2nx/sinx dx (n=1, 2, 3.)

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求不定积分,sin2nx/sinx dx (n=1, 2, 3.)
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求不定积分,sin2nx/sinx dx (n=1, 2, 3.)
求不定积分,sin2nx/sinx dx (n=1, 2, 3.)

求不定积分,sin2nx/sinx dx (n=1, 2, 3.)