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https://jdpu.uz/en/mavzu-ikki-olchovli-integrallar-ikki-olchovli-integrallarda-ozgaruvchini-almashtirish/
(O`zbek) MAVZU: IKKI O’LCHOVLI INTEGRALLAR.IKKI O’LCHOVLI INTEGRALLARDA O’ZGARUVCHINI ALMASHTIRISH.
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