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Let F , G , and H be differential functions on [ a , b ] , [ c , d ] , and [ e , f ] , respectively, where a , b , c , d , e , and f are real numbers such that a < b , c < d , and e < f . Show that

a b c d e f F ( x ) G ( y ) H ( z ) d z d y d x = [ F ( b ) F ( a ) ] [ G ( d ) G ( c ) ] [ H ( f ) H ( e ) ] .
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In the following exercises, evaluate the triple integrals over the bounded region E = { ( x , y , z ) | a x b , h 1 ( x ) y h 2 ( x ) , e z f } .

E ( 2 x + 5 y + 7 z ) d V , where E = { ( x , y , z ) | 0 x 1 , 0 y x + 1 , 1 z 2 }

77 12

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E ( y ln x + z ) d V , where E = { ( x , y , z ) | 1 x e , 0 y ln x , 0 z 1 }

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E ( sin x + sin y ) d V , where E = { ( x , y , z ) | 0 x π 2 , cos x y cos x , −1 z 1 }

2

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E ( x y + y z + x z ) d V , where E = { ( x , y , z ) | 0 x 1 , x 2 y x 2 , 0 z 1 }

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In the following exercises, evaluate the triple integrals over the indicated bounded region E .

E ( x + 2 y z ) d V , where E = { ( x , y , z ) | 0 x 1 , 0 y x , 0 z 5 x y }

439 120

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E ( x 3 + y 3 + z 3 ) d V , where E = { ( x , y , z ) | 0 x 2 , 0 y 2 x , 0 z 4 x y }

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E y d V , where E = { ( x , y , z ) | 1 x 1 , 1 x 2 y 1 x 2 , 0 z 1 x 2 y 2 }

0

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E x d V , where E = { ( x , y , z ) | 2 x 2 , −4 1 x 2 y 4 x 2 , 0 z 4 x 2 y 2 }

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In the following exercises, evaluate the triple integrals over the bounded region E of the form E = { ( x , y , z ) | g 1 ( y ) x g 2 ( y ) , c y d , e z f } .

E x 2 d V , where E = { ( x , y , z ) | 1 y 2 x y 2 1 , −1 y 1 , 1 z 2 }

64 105

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E ( sin x + y ) d V , where E = { ( x , y , z ) | y 4 x y 4 , 0 y 2 , 0 z 4 }

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E ( x y z ) d V , where E = { ( x , y , z ) | y 6 x y , 0 y 1 x , −1 z 1 }

11 26

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E z d V , where E = { ( x , y , z ) | 2 2 y x 2 + y , 0 y 1 x , 2 z 3 }

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In the following exercises, evaluate the triple integrals over the bounded region

E = { ( x , y , z ) | g 1 ( y ) x g 2 ( y ) , c y d , u 1 ( x , y ) z u 2 ( x , y ) } .

E z d V , where E = { ( x , y , z ) | y x y , 0 y 1 , 0 z 1 x 4 y 4 }

113 450

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E ( x z + 1 ) d V , where E = { ( x , y , z ) | 0 x y , 0 y 2 , 0 z 1 x 2 y 2 }

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E ( x z ) d V , where E = { ( x , y , z ) | 1 y 2 x y , 0 y 1 2 x , 0 z 1 x 2 y 2 }

1 160 ( 6 3 41 )

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E ( x + y ) d V , where E = { ( x , y , z ) | 0 x 1 y 2 , 0 y 1 x , 0 z 1 x }

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In the following exercises, evaluate the triple integrals over the bounded region

E = { ( x , y , z ) | ( x , y ) D , u 1 ( x , y ) x z u 2 ( x , y ) } , where D is the projection of E onto the x y -plane.

D ( 1 2 ( x + z ) d z ) d A , where D = { ( x , y ) | x 2 + y 2 1 }

3 π 2

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D ( 1 3 x ( z + 1 ) d z ) d A , where D = { ( x , y ) | x 2 y 2 1 , x 5 }

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D ( 0 10 x y ( x + 2 z ) d z ) d A , where D = { ( x , y ) | y 0 , x 0 , x + y 10 }

1250

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D ( 0 4 x 2 + 4 y 2 y d z ) d A , where D = { ( x , y ) | x 2 + y 2 4 , y 1 , x 0 }

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The solid E bounded by y 2 + z 2 = 9 , z = 0 , and x = 5 is shown in the following figure. Evaluate the integral E z d V by integrating first with respect to z , then y , and then x .

A solid arching shape that reaches its maximum along the y axis with z = 3. The shape reach zero at y = plus or minus 3, and the graph is truncated at x = 0 and 5.

0 5 −3 3 0 9 y 2 z d z d y d x = 90

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The solid E bounded by y = x , x = 4 , y = 0 , and z = 1 is given in the following figure. Evaluate the integral E x y z d V by integrating first with respect to x , then y , and then z .

A quarter section of an oval cylinder with z from negative 2 to positive 1. The solid is bounded by y = 0 and x = 4, and the top of the shape runs from (0, 0, 1) to (4, 2, 1) in a gentle arc.
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[T] The volume of a solid E is given by the integral −2 0 x 0 0 x 2 + y 2 d z d y d x . Use a computer algebra system (CAS) to graph E and find its volume. Round your answer to two decimal places.

V = 5.33
A complex shape that starts at the origin and reaches its maximum at (negative 2, negative 2, 8). The shape is truncated by the x = y plane, the x = 0 plane, the y = negative 2 plane, the z = 0 plane, and a complex triangular-like shape with curved edges and sides (negative 2, negative 2, 8), (0, 0, 0), and (0, negative 2, 4).

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[T] The volume of a solid E is given by the integral −1 0 x 2 0 0 1 + x 2 + y 2 d z d y d x . Use a CAS to graph E and find its volume V . Round your answer to two decimal places.

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In the following exercises, use two circular permutations of the variables x , y , and z to write new integrals whose values equal the value of the original integral. A circular permutation of x , y , and z is the arrangement of the numbers in one of the following orders: y , z , and x or z , x , and y .

0 1 1 3 2 4 ( x 2 z 2 + 1 ) d x d y d z

0 1 1 3 2 4 ( y 2 z 2 + 1 ) d z d x d y ; 0 1 1 3 2 4 ( x 2 y 2 + 1 ) d y d z d x

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1 3 0 1 0 x + 1 ( 2 x + 5 y + 7 z ) d y d x d z

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0 1 y y 0 1 x 4 y 4 ln x d z d x d y

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−1 1 0 1 y 6 y ( x + y z ) d x d y d z

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Set up the integral that gives the volume of the solid E bounded by y 2 = x 2 + z 2 and y = a 2 , where a > 0 .

V = a a a 2 z 2 a 2 z 2 x 2 + z 2 a 2 d y d x d z

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Practice Key Terms 1

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Source:  OpenStax, Calculus volume 3. OpenStax CNX. Feb 05, 2016 Download for free at http://legacy.cnx.org/content/col11966/1.2
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