document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=901688>Question 901688</A>: <I><SPAN STYLE=\"word-break: break-all;\"> q(x)=5.3cos(pi(x)/9) <BR>\n" );
document.write( "what is the period?<BR>\n" );
document.write( "I know the amplitude is 5.3 but I can't find the period. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #546873 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=546873\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The standard trig form for cos is<BR>\n" );
document.write( "y = Acos(Bx+C) + D<BR>\n" );
document.write( "we are given <BR>\n" );
document.write( "q(x)=5.3cos(pi(x)/9)<BR>\n" );
document.write( "note that C and D are both 0 and pi = 180 degrees, therefore<BR>\n" );
document.write( "q(x) = 5.3cos(20x)<BR>\n" );
document.write( "the period(T) for sin and cos = (2*pi) / B <BR>\n" );
document.write( "B = 20 and pi = 180<BR>\n" );
document.write( "T = (2 * 180) / 20 = 18 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );