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<div dir="ltr">Hi,<br>
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<div>Formularesponse using cas with maxima works great. </div>
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<div><problem><br>
<script type="loncapa/perl"><br>
$ansa = &cas('maxima','1/sqrt(4*pi^2*L*C)');<br>
</script><br>
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<startouttext />What is formula for resonant frequency for an LC circuit? <endouttext /><br /><br>
<br>
<startouttext /><m>$ \omega_{res} = $</m><endouttext /><br>
<formularesponse answer="$ansa" id="12"><br>
<textline readonly="no" /><br>
</formularesponse><br>
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</problem><br>
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<div>Regards,</div>
<div>-hk</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Nov 21, 2019 at 11:05 AM SIMIN, GRIGORY <<a href="mailto:SIMIN@engr.sc.edu">SIMIN@engr.sc.edu</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="gmail-m_-4797884704070664240MsoPlainText">Hi all!<u></u><u></u></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">I've found a strange issue in some problems requiring formula response.<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">I have a simple question to enter the formula for the resonant frequency.<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">An example of correct answer is (in other variations the formula could be a bit more complex than this one)<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">1/(2*pi*sqrt(L*C))<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">The correct solution is checked by sampling L and C values.<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">When I am entering the answer, I can see that LON-CAPA recognizes it because it displays the formatted formula as I am entering it:<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black"><img width="429" height="119" id="gmail-m_-4797884704070664240Picture_x0020_1" src="cid:16e8f5cf6cc6917eb1"></span><span style="color:black"><u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black"><u></u> <u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">But when I press submit, I got the response:<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">“unable to understand formula”<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black"><u></u> <u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">By experimenting with this, I found that the issue happens because of “pi” being a part of the answer.<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">If pi is replaced with 3.141, everything would work.<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">But it feels weird asking students to enter 3.141 instead of pi; besides, I don’t even want to give them a hint that pi is a part of the answer.
<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black"><u></u> <u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">Why is this happening? Apparently LON-CAPA knows what “pi” means because it displays it correctly.<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black"><u></u> <u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">Thanks!<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black">Grigory<u></u><u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black"><u></u> <u></u></span></p>
<p class="gmail-m_-4797884704070664240MsoPlainText"><span style="color:black"><u></u> <u></u></span></p>
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