I want to draw a graph of this non-linear equation

d^2*y/dt^2+y^3-sin*t = 0

when:

y(0) =0

y'(0)=1

someone can help me ?? 

Hi 

I have a problem with my three task to do in Maple (ver.16)

1. I have a differential equations:

dy/dt=-y, y(0)=1

How to do it in Maple (using Dsolve command) and how to draw this ?

2. Solve and draw second-order differential equation :

d²y/dt²+y(t)=sin t   ; y(0)=0 ; y'(0)=1

3. Solve and draw equation: