Compute: {{MATH_48}} {{CMD_49}} Rewriting this as {{MATH_50}} set {{MATH_51}} and {{MATH_52}} so that {{MATH_53}}. Now {{MATH_54}} and by the product and chain rules {{MATH_55}} Since {{MATH_56}} and {{MATH_57}}, write {{MATH_58}} {{CMD_59}} {{CMD_60}}