15_R_1 - 3 ( e 2-1 ) 2 e .

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1. : x = t , y = 2 e t , z = e 2 t , ( - 1 t 1 ) v = p 1 + 4 e 2 t + 4 e 4 t = 1 + 2 e 2 t Z ds y = Z 1 - 1 1 + 2 e 2 t 2 e t dt = ± - e - t 2 + e t ²³ ³ ³ ³ 1 - 1 =
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