Which of the six trigonometric functions are not defined at 0?

Solve for x i'll try to attach the files bc it's not letting me for some reason

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.