document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=650303>Question 650303</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi,\r<BR>\n" );
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document.write( "I am just beginning Precalculus and am looking at two short statements of the same nature - the instructions ask me to tell whether the trigonometric function is positive, negative, 0, or undefined. I am confused about what qualifies a trigonometric function as any of these. I am looking at these two:\r<BR>\n" );
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document.write( "csc (2pi/3) and (sec450º)\r<BR>\n" );
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document.write( "I managed to get both undefined but I do not know how, and I doubt that is correct. If somebody could please explain to me how to tell what the nature of these problems are, I would really appreciate it!\r<BR>\n" );
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document.write( "-Alex </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #407382 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=407382\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> csc (2pi/3) and (sec450º)<BR>\n" );
document.write( "Each circle contains 360º or 2&#960; radians divided into 4 quadrants.<BR>\n" );
document.write( "All you need to do is determine which quadrant the angle is in from which you can determine its sign as follows:<BR>\n" );
document.write( "quadrant I:<BR>\n" );
document.write( "all functions>0<BR>\n" );
document.write( "..<BR>\n" );
document.write( "quadrant II<BR>\n" );
document.write( "sin and csc >0<BR>\n" );
document.write( "cos and sec<0<BR>\n" );
document.write( "tan and cot<0<BR>\n" );
document.write( "..<BR>\n" );
document.write( "quadrant III<BR>\n" );
document.write( "sin and csc <0<BR>\n" );
document.write( "cos and sec<0<BR>\n" );
document.write( "tan and cot>0<BR>\n" );
document.write( "..<BR>\n" );
document.write( "quadrant IV<BR>\n" );
document.write( "sin and csc <0<BR>\n" );
document.write( "cos and sec>0<BR>\n" );
document.write( "tan and cot<0<BR>\n" );
document.write( "..<BR>\n" );
document.write( "csc (2pi/3) is in quadrant II, therefore, its sign>0<BR>\n" );
document.write( "sec450ºis going around the circle once and ending at 90º or &#960;/2<BR>\n" );
document.write( "sec 450º=1/cos450º=1/cos90º=1/0=undefined<BR>\n" );
document.write( "hope this helps\r<BR>\n" );
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document.write( " </SPAN>\n" );
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