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<center><h3>Examples of interactive exercises under OEF format</h3></center> <p>
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<h3>Examples of interactive exercises under OEF format</h3>
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Here are some exampls of interactive exercises one can create by Createxo.
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Here are some exampls of interactive exercises one can create by Createxo.
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<ol>
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<ol>
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<li> <hr style="width:50%"/><b>Length of vector 2D</b>, a simple computation of the length of
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<li> <hr style="width:50%"/><b>Length of vector 2D</b>, a simple computation of the length of
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!set parm=oef_answercnt=1&oef_choicecnt=0&oef_title=Norm of vector 2D&oef_format=html&oef_computeanswer=no&level=2&oef_parms=%5Cinteger%7Bx%3Drandom%28-10..10%29%7D%0D%0A%5Cinteger%7By%3Drandom%28-10..10%29%7D%0D%0A%5Creal%7Bnorm%3Dsqrt%28%28%5Cx%29%5E2%2B%28%5Cy%29%5E2%29%7D&oef_statement=What is the length of the vector %28%5Cx%2C%5Cy%29 in R%3Csup%3E2%3C%2Fsup%3E%3F&ansprompt1=The length&ansgood1=%5Cnorm&oef_hint=The length f a vector %28x%2Cy%29 is equal to %0D%0Asqrt%28x%5E2%2By%5E2%29.&oef_solution= $
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!set parm=oef_answercnt=1&oef_choicecnt=0&oef_title=Norm of vector 2D&oef_format=html&oef_computeanswer=no&level=2&oef_parms=%5Cinteger%7Bx%3Drandom%28-10..10%29%7D%0D%0A%5Cinteger%7By%3Drandom%28-10..10%29%7D%0D%0A%5Creal%7Bnorm%3Dsqrt%28%28%5Cx%29%5E2%2B%28%5Cy%29%5E2%29%7D&oef_statement=What is the length of the vector %28%5Cx%2C%5Cy%29 in R%3Csup%3E2%3C%2Fsup%3E%3F&ansprompt1=The length&ansgood1=%5Cnorm&oef_hint=The length f a vector %28x%2Cy%29 is equal to %0D%0Asqrt%28x%5E2%2By%5E2%29.&oef_solution= $
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!href cmd=reply&mode=guided&$parm load this example into the menu
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!href cmd=reply&mode=guided&$parm load this example into the menu
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 to test it. (You can also copy the source into the menu under raw mode.)
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 to test it. (You can also copy the source into the menu under raw mode.)
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<li> <hr style="width:50%"/>
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</li><li> <hr style="width:50%"/>
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<b>Trace of matrix 2x2</b>, computes the trace of a matrix. The question
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<b>Trace of matrix 2x2</b>, computes the trace of a matrix. The question
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 is formatted by TeX, for a better presentation of the matrix. Here is
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 is formatted by TeX, for a better presentation of the matrix. Here is
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 the complete source of the exercise.
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 the complete source of the exercise.
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<pre>
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<pre>
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\title{Trace of matrix 2x2}
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\title{Trace of matrix 2x2}