变换

syms t;
g=t*exp(-3*t);
laplace(g)

f=8*sin(5*t)-exp(-t)*cos(2*t);
laplace(f)

syms s;
g=1/s-(2*s^2+3)/(s^2+9);
ilaplace(g)

f=s/(s^2-49)-3/(s^2-9);
ilaplace(f)

g=(2/s)/(1+s);
ilaplace(g)

fourier(t^2)
fourier(t*cos(t))

syms w;
f=1/(1+i*w);
ifourier(f)