(Employers may not begin the Form I-9 process until an individual accepts an offer of employment.) Forms I-9 must be kept for three years after the date of hire or one year after the date of the employee's termination, whichever is later.
Sine qua non (/ËsaÉªni kweÉª ËnÉn/; Latin: [Ësine kwaË ËnoËn]) or conditio sine qua non (plural: conditiones sine quibus non) is an indispensable and essential action, condition, or ingredient.
They are based on the sides and angles of a right triangle, and they define the relationships of the sides and angles of a triangle with respect to one another. Sine, cosine, and tangent (abbreviated sin, cos, and tan) can calculate angles of the triangle when the sides are known and sides when the angles are known.