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Unformatted text preview: yaxis. 3 4 dx dy = 15 = s . . S A rs = 3 5 = 15 = From geometry: Example: y x = rotated about xaxis. 2 9 2 1 dy S y dx dx = + 2 ( (1 ( , ) ^ 2), ,0,9) y d y x x + 117.319 ENTER ( ) x ENTER Y STO Example: 2 2 1 y x = 2 1 y x =12.5663706144 Check: rotated about xaxis. 2 2 1 x y + = 2 1 1 2 1 dy S y dx dx  = + 2 ( (1 ( , ) ^ 2), , 1,1) y d y x x + 2 . . 4 S A r = 4 = 12.5663706144 ENTER (1 ^ 2) xENTER Y STO Dont forget to clear the x and y variables when you are done! ENTER F4 4 , Y X Once again...
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 Spring '08
 Smith

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