Scheme -- Sqrt not working

Hey!<br /><br />I'm having a little problem with a program I'm trying to write in Dr Scheme<br />I wrote <br /><!--coloro:#FF0000--><span style="color:#FF0000"><!--/coloro-->(define (vectornorm t n s)<br /> (sqrt (+ (expt t 2) (expt n 2) (expt s 2)) 1/2))<!--colorc--></span><!--/colorc--><br /><br />But it gives error in the square root part. Can anyone help me?<br /><br />
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