• In 0: x = var(:name=>'x')
  Out 0: x
• In 1: Sin[x**2].diff(x)
  Out 1: 2*(cos(x**2))*x
• In 2: Exp[4.3]
  Out 2: 73.6997936995958
• In 3: plot2d([Sin[x].taylor(x,0,2),Sin[x].taylor(x,0,4),Sin[x].taylor(x,0,6),Sin[x]],x,[-2*PI,2*PI],[-2*PI,2*PI])
  Out 3:

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