Error in code, "Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses. "

Question

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I'm trying to write in a derivative of f(t)= (1)/(55) (20π sin((1)/(11) π t) + 33ℯ^(-((3)/(10)) t) sin(2π t) - 220π ℯ^(-((3)/(10)) t) cos(2π t))

here's what I'm writting in:

Td=1/55*(20*pi*sin(1/11*pi*t)+33*exp(-3/10*t).*sin(2*pi*t)-220*pi*exp(-3/10*t).*cos(2*pi*t)) t;

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Answer 1

the cyclist 2021-3-25

编辑：the cyclist 2021-3-25

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You seem to have a rogue t at the end of your expression. If you get rid of that, then ...

Td=1/55*(20*pi*sin(1/11*pi*t)+33*exp(-3/10*t).*sin(2*pi*t)-220*pi*exp(-3/10*t).*cos(2*pi*t));

Note that in the MATLAB editor, a red squiggly line appeared under that t, indicating the syntax error.