**<Example>**

How to calculate following differential equation.

**y''(x)=-y^3-0.05y'+7.5cos(x) [x=0 to 100, y(0)=0,
y'(0)=0]**

**Step 1:**

Input equation like this.

**Step 2:**

Press "Set Condition" button and input like this.

**Step 3:**

Press button.

And Mathbrain begins calculation and draws graph at the same
time like this.

If you use Mathematica to calculate, you need to type following script.

In[1]:=

NDSolve[{y''[x] == -y[x]^3-0.05 y'[x]+7.5 Cos[x],y'[0] == 0,y[0] == 0},y[x],{x,0,100},MaxSteps->10000]

Out[1]=

{{y[x] -> InterpolatingFunction[{0., 100.}, <>][x]}}

In[2]:=

Plot[y[x] /. %,{x,0,100}]

And Mathematica begins calculation and draws graph. You need
to wait to see graph until calculation finishes.