Mathematics of happiness

Everyone knows and probably have heard about this formula of happiness, yet we often forget to apply it on daily life. Here is the formula:  

Happiness = Reality - Expectation.
So don't get too complicated on pursuing and formulating happiness, it probably as simple as lowering you expectation to everything surrounds you. Don't expect too much from your family, from your partner, from your company, from your kids and friends.

Definition of Happiness
happinessnountrying to rediscover the happiness we once knew contentment,satisfaction, cheerfulness, merriment, gaiety, joy, joyfulness, joviality,jollity, glee, delight, good spirits, lightheartedness, well-being,enjoyment.
Definition of Reality
reality |rēˈalətē|noun ( pl. -ties)1 the world or the state of things as they actually exist, as opposed to an idealistic or notional idea of them : he refuses to face reality | Laura was losing touch with reality.• a thing that is actually experienced or seen, esp. when this is grim or problematic : the harsh realities of life in a farming community | the law ignores the reality of the situation.• a thing that exists in fact, having previously only existed in one's mind: the paperless office may yet become a reality.• the quality of being lifelike or resembling an original : the reality of Marryat's detail.
Definition of Expectation
expectation |ˌekspekˈtā sh ən|nouna strong belief that something will happen or be the case in the future :reality had not lived up to expectations | an expectation that the government will provide the resources | he drilled his men in expectation of a Prussian advance.• a belief that someone will or should achieve something : students had high expectations for their future.• ( expectations) archaic one's prospects of inheritance.