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Question in Derivative and limits substitution

Posted on 2013-12-09
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I am going through the solution of a problem and i dont understand how he got the values for theita ( see attachment)

0<theita<1.3694

obviously after the transformation of X as a function of cos Theita , there is some limit transformation as well.

Any input would be appreciate it.
4-6.doc
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Question by:c_hockland
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by:ozo
ID: 39705640
It might help to know what problem was being solved, but it would seem to be because -0.05 + .25*cos(theta) > 0
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by:c_hockland
ID: 39705658
let me post the question and complete solution Ozo
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by:c_hockland
ID: 39705660
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TommySzalapski earned 500 total points
ID: 39706095
x = (1-cos(theta))*c/2
So x/c = (1-cos(theta))/2

For 0 <= x/c <= .4 then translates to
For 0 <= (1-cos(theta))/2 <= .4

Solve that for theta and you will see that theta is bounded by 0 and 1.3694
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