document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=712880>Question 712880</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need to find the amplitude, period and displacement of y=3cos(2x-pi/2)\r<BR>\n" );
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document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #438201 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=438201\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> General form:<BR>\n" );
document.write( "y = a cos k(x-b) <BR>\n" );
document.write( "where<BR>\n" );
document.write( "amplitude is |a|<BR>\n" );
document.write( "period is 2(pi)/k<BR>\n" );
document.write( "phase shift is b<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Your equation <BR>\n" );
document.write( " y=3cos(2x-pi/2) <BR>\n" );
document.write( "factor out the 2:<BR>\n" );
document.write( " y=3cos 2(x-pi/4)<BR>\n" );
document.write( "so, from inspection then<BR>\n" );
document.write( "amplitude: 3<BR>\n" );
document.write( "phase shift: (pi)/4<BR>\n" );
document.write( "period:<BR>\n" );
document.write( "(2(pi))/2 <BR>\n" );
document.write( "pi<BR>\n" );
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