9 1 3 _ . 4. Consider the integral 1 T\"; d3; 1 [a] Provide three different (and nonidentity, i.e.. not. it. = .13] valid n-aubatitutiona that can he used to evaluate this integral. Make sure to Show that your substitution is Tmlicl. That is. perform your change of variable but do w evaluate the resulting integral. [b] Complete the evaluation of this integral for one of your naubatitntiom; from part (a)