document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=744711>Question 744711</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am calculating angles and must figure out cosine to the power of -1.<BR>\n" );
document.write( "I know what square root is etc., but how do you calculate to a minus power? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #453553 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=453553\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> According to context you are referring to inverse function of cosine.  Let me use different notation than the \"exponent negative 1\".\r<BR>\n" );
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document.write( "let x be some angle or angle measurement.<BR>\n" );
document.write( "cos(x) is some number between -1 and +1.\r<BR>\n" );
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document.write( "The inverse function of cosine, is \"arcos()\", read as \"the arc whose cosine is...\".  The input is NOT an angle measurement, but is a cosine value.  \r<BR>\n" );
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document.write( "Common value:  30 degrees is a commonly known or used angle value.   DRAW a unit circle to visualize this.  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%2830%29=%281%2F2%29sqrt%283%29 ALIGN=MIDDLE  ALT=\"cos%2830%29=%281%2F2%29sqrt%283%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Now, it may be asked, what is the arc which has a cosine of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281%2F2%29sqrt%283%29 ALIGN=MIDDLE  ALT=\"%281%2F2%29sqrt%283%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > ?<BR>\n" );
document.write( "This is equivalent to asking, what is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=arcos%28sqrt%283%29%2F2%29 ALIGN=MIDDLE  ALT=\"arcos%28sqrt%283%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > ?<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=arcos%28sqrt%283%29%2F2%29=30 ALIGN=MIDDLE  ALT=\"arcos%28sqrt%283%29%2F2%29=30\"   DISABLED_style= \"max-width:90%; height:auto;\" >. </SPAN>\n" );
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