Create MATLAB: Interpolate the given function using Chebyshev grids of increasing degree. Do the interpolants converge numerically? If so$,$ at approximately what degree?

Concede defeat if numerical convergence does not occur by degree $300.$

$5)($x$^2-3$x$-1)/(3$x$+10),-3$x $15$

$10)$ arctan$($x$),-3$x $3$