document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=594792>Question 594792</A>: <I><SPAN STYLE=\"word-break: break-all;\"> sin(-55)  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #376935 by </B><A HREF=/tutors/aboutme.mpl?userid=math-vortex><B>math-vortex(648)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math-vortex><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/cgi-bin/show-face.mpl?user=math-vortex><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=376935\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hi, there,\r<BR>\n" );
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document.write( "I will assume that you are working in degrees, and want to know the sine of a 55 degree angle. You can just type this expression into a calculator and get an approximation, but I'm guessing that you want to simplify it to the sine of positive angle.\r<BR>\n" );
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document.write( "We have:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28-55%29 ALIGN=MIDDLE  ALT=\"sin%28-55%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Use an even/odd trigonometric identity to rewrite the expression. The sine function is odd, so sin(-x) = -sin(x). Therefore,\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28-55%29=-sin%2855%29 ALIGN=MIDDLE  ALT=\"sin%28-55%29=-sin%2855%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "You can stop here with an exact answer, or use a calculator to get an approximation:<BR>\n" );
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document.write( "-sin(55) is approximately equal to -0.819152044.<BR>\n" );
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document.write( "Here is a link to a nice pdf \"cheat sheet\" of everything you ever wanted to know about trigonometric functions, identities, etc.<BR>\n" );
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document.write( "http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf<BR>\n" );
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document.write( "Hope this helps! Feel free to email me if you have questions about this solution.<BR>\n" );
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document.write( "Mrs.Figgy<BR>\n" );
document.write( "math.in.the.vortex@gmail.com<BR>\n" );
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