Question: How do I solve a system of ODE with Picard iteration ?

Hi

 

I want to write this system and solve it by picard iteration method

but I don't know how to write a system of ODE in maple

 

x'=cos (x)    x(0)=1

y'= sin (z)    y(0)=-1

z'= zy           z(0)=2

 

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