Which of the following equations does not represent the sinusoidal function graphed below?
y = -2sin2x
y = 2sin2x + pie/2
y = 2sin2(x + pie/2 )
y = 2sin(2x + π)

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?