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1252. 6 dx dy dz. 1253. (4y dx 一 Зх dy)3 (dy)3. 1254. ех+У (dx-\-dy)b. 1257, 4/sin 2x.1258. 2ズ(3ぷ+ 2)/(ズ2 + 3ズ+ l) 2. 1259. -^ - = 2x cos xf ~f^ — x (2 cos x 一 x sin ît).讓 . 0.1 26!. f = 4 g , | i = 4n. 1262. | = f 顏 . ( 荃 レ i .1269. 去 . 1270. 1271. \gradu]M = \lrl;cos a = —ズ0/,0 ^ 2 + C . 1414. (1/2) XХіп(л:2— 4л: + 7) + С. 1415. (5/2) In (л:2 + Юл:+ 2 9 ) — 11 arctg (л:+5)/2 + С.1416.(1 / 10)1 n (5x2 + 2л; + 1 ) + (2/5) a r et g (5л: + 1)/2+ C. 1417. x /【8 (a:2 + 2)2] ++3^/[32 (*2+ l) ] + ( 3 V"2/64) arctg {x l\^ 2 ) + C. 1418. ( л : - 7)/【8 い2 + 2ズ+ 5)] ++(1/16) arctg ( jt+ l) /2 + C . 1428. —(2/3) ln | ズ 丨 + (5ノ3 )ln | л: — 3 | + C. 1429.302

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