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21. Suppose the demand mctions for two products are q, = f (p, , p1) and q; = 3(P: . P2 ), where p., p2, ql, and q; are the prices (in dollars) and quantities for products 1 and 2. Consider the four partial derivatives 13$ 6i E and , , . Tell the sign of each of these partial 6P1 6P2 6P1 6P2 derivatives if a. the products are complementary goods. b. the products are substitute goods. find the derivative and second derivative of each function. 22. f(x) = In(x2 +4)