Two Problerms about Maxima



1. about bessel function, like this:
 
2*%pi*besselj(0,x)=integrate(exp(%i*x*cos(w)),w,0,2*%pi)  How can I express equation in maxima? integrate(exp(x*cos(w)),w,0,2*%pi) doesn't return 2*%pi*besselj(0,x). 
And I have tried to give x a value (like x:3) and to solve a defined integrate.However the answer isn't true. 
 
2. it is a problerm in WinXp,I've installed wxmaxima in my UBUNTU OS too,and it works fine.   When I use plot2d function to plot a graphics,I find my mouse(right button exactly) doesn't work in the "gnuplot graphics" window. That is to say I cannot magnify my graphics as I like. It is strange that in UBUNTU everything is OK. Anyone can help?  In addition, the left button can work perfectly and my middle button too, and there is no problerm if I run wgnuplot.exe separately. 
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