Match each of the trigonometric expressions below with the equivalent non-trigonometric function from the following list. Enter the appropriate letter (A, B,C, D, or E) in each blank. A. tan(arcsin(x/3))
B. cos( arcsin (x/3))
C. (1/2) sin(2 arcsin(x/3))
D. sin(arctan(x/3))
E. cos(arctan(x/3))
1. x/(9−x^2)1/2
2. x/9(9−x^2)^1/2
3. 3/(9+x^2)^1/2
4. (9−x^2)^1/2/3
5. x/(9+x^2)^1/2