[sin 2x + c ] = 2 cos 2x. 複習:微分⇔不定積分(加常數C). / [C] = 0. So dx = c, c = $. 2₁ [x]' = 1, Sidx = x + c. 3. [[x²+] = (n+1) X^. = lx 1x) + C.
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