Yes. Inputs to functions always go in square brackets. Also Ln is not a valid Mathematica function. A single equal sign at the beginning of the line fixes your syntactic mistake:

I would suggest that you do this course

https://www.wolfram.com/language/elementary-introduction/2nd-ed/

to get started with the Wolfram Language. A couple of pages and you should know why the input you used did not work.

Best wishes,

Marco

Thank you so much last question I'm sorry you've been so helpful! Is there anything wrong with this input that it would only output one equation and not both? Plot[{Ln (x), 3 - x^2}, {x, 1, 2}]

How did you do that:

Plot[{Sin[E^x], x^2 - 1}, {x, 0, 2}]

Cheers,

Marco

PS: Note that the E needs to be capital.

I tried exactly what I did for the first one just switched out the equations but it appears that only the x^2 -1 equation is showing up on the graph.

Thank you so much!! Do you know how to plot these two equations sin(e^x)=x^2-1 in the interval [0,2] and find the intersection points???

Also does anyone know how to plot these two equations sin(e^x)=x^2-1 in the interval [0,2] and find the intersection points???

Hi Lexie,

I am not quite sure what you mean by "two equations", where you only give x=cosx. In theory this can be plotted using:

Plot[{x, Cos[x]}, {x, -1, 3}]

There are various ways to solve this. For example:

FindRoot[x == Cos[x], {x, 1}]
(*{x -> 0.739085}*)

or

NSolve[{x == Cos[x] && x > 0 && x < Pi/2}, x]
(*{{x -> 0.739085}}*)

Cheers,

Marco