Write a Matlab function myCosh that takes as input x and the number of terms N to use to estimate cosh $($x$),$ i$.$e$.,$

and returns the estimate for cosh$($x$)$ together with the corresponding true relative error. You may use the Matlab function factorial$()$ to calculate the factorial in the formula. For the true value of cosh$($x$)$ use Matlab$$s build$-$in function cosh$($x$).$ Do not print out any results to screen or do any plotting within the function.