求不定积分 cos根号x除以根号x dx

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令x = u²，dx = 2u du
∫ (cos√x)/滑没态察物√x dx
= ∫ cos(u)/信源u * (2u du)
= 2∫ cos(u) du
= 2sin(u) + C
= 2sin(√x) + C

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