Use the diagram to solve. What is 260% of 6

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

If the value of cos330°is√3/2 then find cos 165°.

Which is an x-intercept of the graphed function? (0, 4) (–1, 0) (4, 0) (0, –1)