1. The following Matlab function function y- mytanh (x) y (exp (x)-exp (-z) ) / (exp (x)-exp (-x)) for computing tanh(x) (ex-e-x)/(ex + e-x) was found to return NaN for (a) Rewrite the code so that it computes accurate values for both large and (b) Test your code for the values: x 10%, k--2,-1, 0, , 2, 3 . Recre- large values of |x| (say x 1000) small values of x whether x is positive or negative. Submit your code ate the table below and fill it in with the values from your function rmytanh xtnh Cx) +10 +10 rmytanh(x)tanh(x) 10 10 +10 +10+ +10+ 10 10+ -10+ You can compare with the built-in function tanh. 2. The variance s2 of a set of values xi,x2, ...,Xn is given by 12 (xi-x)2, where 12 A commonly used alternative formula is Get the set of values from hw2q4datafile.mat, and compute the variance by the two formulas above. You can load the data into Matlab using