(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.
A sinusoidal curve is the graph of the sine function in trigonometry. A sinusoid is the name given to any curve that can be written in the form. The example at the right is. The cosine wave is also said to be sinusoidal because of the relationship which makes it the sine wave with a horizontal shift.