734604588_7_Ch1-作业解答-2010

734604588_7_Ch1-作业解答-2010

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Ch1- 8 ž ë ¹ª* ( ) sin sin y t t t π = + D sin t 2 sin t t 2 2245 D 2245 D ( ) y t D ( ) y t D T t t 2200 ( ) ( ) y t T y t + = 0 t = sin sin 0 T T + = ….(1) ( ) ( ) y t T y t + = sin( ) sin( ) sin sin t T t T t t + + + = + ≠♠ cos(2 )sin cos(2 0 t T T t T T + + + = (1) sin sin T T = - [cos(2 ) cos(2 )]sin 0 t T t T T + - + = sin 0 T = sin 0 T = T Z ( ) T k k Z = cos(2 ) cos(2 ) t T t T + = + D t D 2 1 t T + = cos cos1 ( ) y t D 1-4 1-1 8 žë ¹ D f ( t 29 ( 3 2 29 ( 3 29 ( t 29 C D (1). ) 1-1 f ( t 29 f ( t 2 29 f ( 3 t 2 29 f ( 3 t 2 29
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(2). ) f ( t 29 f ( 3 t 29 2 [3( )] 3 f t - f ( 3 t 2 29 (3). ) f ( t 29 f ( t 29 [ ( 2)] f t - + f ( 3 t 2 29
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1-5 ( ) f t t 0 ( ) f t at - 0 a 0 t t a t 1) ( ) f at - 0 t 2) ( ) f at t 0 t t 3) ( ) f at t 0 t a 4) ( ) f at - 0 t a t 4) ( ) f at - 0 t a t 44 ) 1-4) 1-5 1-4 c lD
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1-5 u D t a lD D cD c 1-9 & · ª * Й ´F (1). ( ) (2 ) ( ) t f t e u t - = - 0 1 2 3 4 5 6 0 0.5 1 1.5 2 (2). 2 ( ) (3 6 ) ( ) t t f t e e u t - - = +
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0 1 2 3 4 5 6 0 1 2 3 4 5 6 7 8 9 (3). 3 ( ) (5 5 ) ( ) t t f t e e u t - - = - 3 ( ) 5 5 t t g t e e - - = - 3 '( ) 5 15 0 t t g t e e - - = - + = 1 * ln 3 0.549 2 t = 3 5 5 ( *) 1.925 3 ( 3) g t = - 0 1 2 3 4 5 6 7 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 X: 0.55 Y: 1.924 (4). ( ) cos(10 )[ ( 1) ( 2)] t f t e t u t u t π - = - - -
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0 0.5 1 1.5 2 2.5 3 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1-14 áμp â * 5 ( ) ( 2) t e t t dt δ - -∞ + + 7 0 [ ( ) ( )] j t e t t t dt ϖ - -∞ - - r ( ) ( ) (0) f t t dt f -∞ = 0 0 0 0 ( ) ( ) ( ) ( ) ( ) f t t t dt f t t t dt f t -∞ -∞ - = - = 0=↓ a a 5 ( 2) 2 ( ) ( 2) 2 2 t e t t dt e e - - - -∞ + + = - = - 7 0 0 0 0 [ ( ) ( )] 1 j t j t j t j e t t t dt e e e - - - - -∞ - - = - = -
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1-18 ( “ë ¹ ª* 1-18 ¸Ê º ª *Й ´F áμp â * ( ) ( ) ( ) e o f t f t f t = + … (1) ( ) e f t 빪 ( ) o f t °Ê º ( ) ( ) e e f t f t = - 2 ( ) ( ) o o f t f t = - - 3 1 ~ 38 ë ª * 1 ( ) [ ( ) ( )] 2 e f t f t f t = + - 1 ( ) [ ( ) ( )] 2 o f t f t f t = - - a 8 ( 2) ( ) [ ( 2) ( 3)] t f t e u t u t - - = - - - a-1
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734604588_7_Ch1-作业解答-2010

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