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𝘶-substitution: rational function (video) - Khan Academy
𝘶-substitution with definite integrals (άρθρο) | Ακαδημία Khan
𝘶-substitution: logarithmic function (video) | Khan Academy
u-substitution challenge - Khan Academy
U-substitution and back substitution | Khan Academy
𝘶-substitution: definite integrals (βίντεο) | Ακαδημία Khan
Integrals | Class 12 | Math | Khan Academy
REF: u-substitution definite integrals - Khan Academy Help Center