Now consider {{MATH_66}} to be the variable, and express {{MATH_67}} as a function of {{MATH_68}}. {{CMD_69}} First, let's eliminate the variable {{MATH_70}}. We know that {{MATH_71}} is a constant and that {{MATH_72}} so {{MATH_73}}. Substitute this expression for {{MATH_74}} in the equation {{MATH_75}} {{CMD_76}} {{CMD_77}} {{MATH_78}} {{CMD_79}} {{CMD_80}}