please answer to the questions

I rrect Question 2 If a real positively valued function is integrated, its contour integration will result in either positive, negative or zero real answer. an answer that may be complex. a positive real answer. Question 3 0" 1 Pts Can the integral of f(x)=(1+x\"'2]/i2+ax"'2) be evaluated over the real axis innitysi-zsinnitvr using Cauchv's Residue theorem? No. The answer depends on the value oi a. Incorrect Question 4 0 / 1 pts Can the integral of f(x)=(1+ax^2)/(2+x^2) be evaluated over the real axis -infinity0 be evaluated over the interval 0