7-33  Laplace任
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>> syms s t w x y
>> ilaplace(1/(s-1))
ans =
exp(t)
>> ilaplace(1/(t^2+1))
ans =
sin(x)
>> ilaplace(t^(-sym(5/2)),x)
ans =
4/3*x^(3/2)/pi^(1/2)
>> ilaplace(y/(y^2 + w^2),y,x)
ans =
cos((w^2)^(1/2)*x)
>> ilaplace(sym('laplace(F(x),x,s)'),s,x)
ans =
F(x)
>>
