
第十二题求不定积分
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∫xdx/√(1-x^2)
= -1/2∫(1-x^2)^(-1/2)d(1-x^2)
= -1/2 * 2 * (1-x^2)^(1/2) + C
= -(1-x^2)^(1/2) + C
= -1/2∫(1-x^2)^(-1/2)d(1-x^2)
= -1/2 * 2 * (1-x^2)^(1/2) + C
= -(1-x^2)^(1/2) + C
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