plotting problem with trigonometric functions



Hello :
I have a problem with the command "plot2d(sec(x)*cos(x),[x,-1,1]);"
It does not complete an takes almost all cpu power.
I'm on ubuntu 10.10 64 bits with an amd athlon  processor and 2 GiB of 
memory.
I run the command from rmaxima .
best regards

joaquin