From our diagrams above we see that {{MATH_83}} and computing these areas we find {{MATH_84}} Multiplying through by {{MATH_85}}, and recalling that {{MATH_86}} we obtain {{MATH_87}} Dividing through by {{MATH_88}} and taking the reciprocals (reversing the inequalities), we find {{MATH_89}} Note, {{MATH_90}} and {{MATH_91}}, so these inequalities hold for all {{MATH_92}}. Additionally, we know {{MATH_93}} and so we conclude by the Squeeze Theorem, {{MATH_94}}. {{CMD_95}} {{CMD_96}}