plotting general form of function

Hello! I have a question, can I plot general form of function without data, like in Mathcad. For example plot y=3*x^3+2*sin(x) without having x vector?

thanks

Answer 1

[Bastien Chardonnens]

 You can plot a symbolic expression with 

ezplot(sym_fun)

[Irma]

I just have plot it. Thank you !