Differential Equation
e.g.
solve $ \frac{d x(t)}{dt} = - a x(t)
input: x' == -a*x
result: https://gyazo.com/65869bfe8a7c9bfc1c361a5ad784cecc
initial value problem
e.g.
solve $ \frac{d^2 x(t)}{dt^2} + 2 \frac{d x(t)}{dt} + 5 x(t) = 0, x(0) = 1, \frac{d x(0)}{dt} = 1
input: x'' + 2*x'+5*x = 0, x(0)=1, x'(0)=1
output: https://gyazo.com/51b0a7637aa3e50b42852a9c1014e4d8
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