Can't use toolbox

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I CHUN LIN
I CHUN LIN 2021-4-14
评论: Rik 2021-4-14
Hi,
I want to run the code:
clear
clc
syms k
y = symsum(k^2,k,0,10)
but the result says:
'syms' requires Symbolic Math Toolbox.
I back to check my download and use "ver",
the result shows there is Symbolic Math Toolbox.
Does there is anything wrong?
Thank you very much!

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