investigating the heat rod function.

Length = 50 cm uniform intiial temperature u0 = 100dC and thermal diffusivity k = 0.15. I was given the following code in the text, and it is fine until I put x into the sine term.

it says my error is in line 8. I know it is the x.

How can I get the correct input arguements? Also how would I get the graphs of u(x, 30) abd u(25,t)?

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