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並前往 https://ocw.mit.edu/courses/mathematics/18-01sc-single-variable-calculus-fall-2010/unit-4-techniques-of-integration/part-a-trigonometric-powers-trigonometric-substitution-and-completing-the-square/session-71-integrals-involving-secant-cosecant-and-cotangent/MIT18_01SCF10_Ses71b.pdf
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