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(tanx)^5=(sinx)^5/(cos x)^5令COS X = U 原式= -[(1-U^2)^2/U^5 dU ] =(2/U^3 - 1/U^5 -1/U)dU =-U^-2 +1/4 *U ^(-4)+ ln(U絕對值)+C用COSX換U即可.
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