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Question: How do I plot this ?

Question:How do I plot this ?

Peter_Parker 48
plot
February 27 2011
0

Please help me with the following.

 

I have this function

y(theta,t):=1/4*Pi + A*sin(m*theta) + A*sin(m*theta)* (exp(-1/4 *alpha^2*beta^2)-2)/(4*Pi)*t;

which can also be written as

y(theta,t):=1/4*Pi + A*sin(m*theta)(1 + (exp(-1/4 *alpha^2*beta^2)-2)/(4*Pi)*t);

after factoring.

 

The function depends on theta, an angle and t, time; the alpha and beta are parameters > 0. I want to see what this function looks like. But whenever I try to plot3d I get a warning message 

unable to evaluate the function to numeric values in the region

I have tried several approaches but without joy I would be grateful if someone could please point me in the right direction.

 

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