**Problem : **
Which trigonometric function is equivalent to this expression:
sin( - *x*)
?

**Problem : **
What are the amplitude and period of
*y* = - 3 sin(2*x* + 1)
?

**Problem : **
What are the amplitude and period of
*y* = cos(
*x*)
?

**Problem : **
Which of the trigonometric functions are even, which are odd, and which
are neither?

**Problem : **
What are the period and amplitude of the function below?