document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=618707>Question 618707</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how to solve trigonometric identities? what are common step in all soutions  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #389083 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=389083\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> how to solve trigonometric identities? what are common step in all soutions <BR>\n" );
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document.write( "You don't solve them.<BR>\n" );
document.write( "You're given and equation and you prove it is or isn't an identity.<BR>\n" );
document.write( "Common steps are substitutions of accepted identities.<BR>\n" );
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document.write( "A weak point of most identity problems is that what you're allowed to use is not specified.<BR>\n" );
document.write( "Most know that sin^2 + cos^2 = 1<BR>\n" );
document.write( "But, can you use sin(3x) = 3sin(x) - 4sin^3(x) ??  Some ppl know it, some don't.<BR>\n" );
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