The graph wont be appear

I keep getting this error

Error using *

Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the

number of rows in the second matrix. To perform elementwise multiplication, use '.*'.

Error in un (line 3)

y= t.^2 * cos(t);

Answer 1

[Rik]

Do what the error message tells you to do:

y= t.^2 .* cos(t);