A rectangle PQRS is inscribed in the region between the x-axis and the part of the graph y= cos 4x specified by -pi/8 < x< pi/8. ( the < sign is less than or equal to). Determine the coordinates of P for which the perimeter of PQRS is a maximum.
Im not even sure where to begin...
Do what you usually do..solve for 0...test that value in second derivative...if you forget this stuff look at this page...it has a huge amount of useful calculus review information
http://www.mathhelpforum.com/math-he...-tutorial.html
yip... P'' is -ve hence P is concave down and its a max, so for the given domain the value for x would be pi/24..
thanks for all the help... sorri for all the problems with this one...
i need help with another one im gonna post... if you can please take a look
thanks agian