微分 ⇔不定積分(互逆&驗算). (uv)' = u'v + uv'. /. [乘法微分公式]. (一定可以答對) ... x tan'x - √ √²+ dx = x tan'x - ÷ √ du. S = = x tan x = = In lul + C. = -. T.
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