document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=149438>Question 149438</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me finde the value of cos^-1(0)<BR>\n" );
document.write( "Thank you, Natalie </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #109628 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=109628\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \cos^{-1}\left(0\right)\"> is asking for is an angle. So this means that <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \theta=\cos^{-1}\left(0\right)\">. \r<BR>\n" );
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document.write( "So, let's reference the unit circle\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" src=\"http://www1.fccj.edu/lchandouts/trigresources/Unit_circle_angles.png\"></img>\r<BR>\n" );
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document.write( "From the picture, we can see that the point (0,1) tells us that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%2890%29=0 ALIGN=MIDDLE  ALT=\"cos%2890%29=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28pi%2F2%29=0 ALIGN=MIDDLE  ALT=\"cos%28pi%2F2%29=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > (remember, the x coordinate corresponds to cosine). \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \cos\left(90\right)=0\"> Start with the given equation.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE 90=\cos^{-1}\left(0\right)\"> Take the inverse cosine of both sides. This will eliminate the \"cos\" on the left side.\r<BR>\n" );
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document.write( "So <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \cos^{-1}\left(0\right)=90\"> (in degrees) or <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \cos^{-1}\left(0\right)=\frac{\pi}{2}\"> (in radians) </SPAN>\n" );
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