Exam 6: The Integral

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The value of the definite integral 12π2dx\int _ { - 1 } ^ { 2 } \pi ^ { 2 } d x is

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Suppose S3 is the lower sum of the area enclosed by the graph (x)=1x( x ) = \frac { 1 } { x } , the x-axis, and the lines x = 1 and x = 4 by partitioning [1, 4] into three subintervals [1, 2], [2, 3], and [3, 4]. Then S3 is

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Let A denote the area enclosed by the graph f(x)=x,f ( x ) = \sqrt { x }, the x-axis, and the lines x=1x = 1 and x=9x = 9 . By part 2 of the Fundamental Theorem of Calculus, A is

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The indefinite integral 2xx2+4dx\int \frac { 2 x } { x ^ { 2 } + 4 } d x is

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By part 2 of the Fundamental Theorem of Calculus, π6π4sec2xdx\int _ { \frac { \pi } { 6 } } ^ { \frac { \pi } { 4 } } \sec ^ { 2 } x d x is

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Let A denote the area enclosed by the graph f(x)=cosx,f ( x ) = \cos x, the x-axis, and the lines x=0x = 0 and x=π2x = \frac { \pi } { 2 } . By part 2 of the Fundamental Theorem of Calculus, A is

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The solution to the differential equation dydx=5\frac { d y } { d x } = 5 satisfying the boundary condition y = 4 when x = 2 is

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Let A denote the area enclosed by the graph f(x)=x3,f ( x ) = \frac { \sqrt { x } } { 3 }, the x-axis, and the lines x = 0 and x = 9. Graphing the region and using plane geometry, we can find that A is

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Compute this definite integral using geometric methods: 5525x2dx\int _ { - 5 } ^ { 5 } - \sqrt { 25 - x ^ { 2 } } d x .

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