Oliver K

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17 years, 180 days

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These are questions asked by Oliver K

Hi, i have the following equation system, for which i  already know the solution.

restart:

s1:=(r1*r2-1/(400000000*c1*c2))*(r1+r2)/((r1+r2)^2+(-1/(20000*c1)-1/(20000*c2))^2)
+(-1/20000/c1*r2-1/20000*r1/c2)*(-1/(20000*c1)-1/(20000*c2))/((r1+r2)^2+
(-1/(20000*c1)-1/(20000*c2))^2) = 611.0987791:

s2:=(-1/40000/c1*r2-1/40000*r1/c2)*(r1+r2)/((r1+r2)^2+(-1/(40000*c1)
-1/(40000*c2))^2)-(r1*r2-1/(1600000000*c1*c2))*(-1/(40000*c1)-
1/(40000*c2))/((r1+r2)^2+(-1/(40000*c1)-1/(40000*c2))^2) = -8334.070796:

Hi, i have a dgl i want to transform:

y''-7y'+10y = (sin(2x))/x

The laplace command works, but how can i insert initial conditions ? The help page says:

Hi,

 i have 2 inequal plots i want to show in the same window:

with(plots):
p1 := inequal({x-y <= 1, x+y > 0}, x = -3 .. 3, y = -3 .. 3, optionsfeasible = (color = red)):
p2 := inequal({y < 0, x < 0}, x = -3 .. 3, y = -3 .. 3, optionsfeasible = (color = blue)): display(p1, p2);

Obviously, this doesn't work. Each single plot works. What can i do ?

 

 

Hi, let's say i want the Integration Tutor show me how to integrate a function. Sometimes i don't know what the next step is, so i click the get-hint button. When it says "can you do a change of variables?" then i sometimes can't because i still have no idea. So i click "next step" and the result is shown. But i want to know what the substitution actually was, because it't not always obvious. But Maple doesn't tell me, for example, "t=2x has been applied" or similar. What to do ?
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