Given cos 2 theta= 3/5 and cos theta terminates in quadrant 1 find sin theta and cos theta

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?

The monetary value earned for selling goods or services to customers is called a.) revenue b.) assets c.) money d.) accounting

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x