Which function's graph has asymptotes located at the values x = in?
1. y = cScx
II. y = cos x
III. y = tanx
IV. y = cotx

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.