1. Which of the following function is periodic? a. f(x)=2x^2 + x + 9 b. f(x)= 2x+9 c. f(x)=2sin8x d. f(x)=(squareroot 2x+1) 2. Which of the following functions is periodic? a. f(x)=x^3+5 b. f(x)=2x+5 c. f(x)=cosx + 5 d. f(x)=2squarerootX + 5 3. Which of the following functions is periodic? a. f(x)=x^2 + 3x + 4 b. f(x)= x+3 c. f(x)= 2sin3x +4 d. (2squareroot X + 3) 4. What is the domain of the function f(x)=tan^-1X a. (-infinity, +infinity) b. -1< X <1 c. [-pi/2, pi/2] d. [-1,1] 5. What is the domain function f(x)=cos^-1X a. (-pi,+pi) b. -1< X <1 c. [-pi/2, pi/2] d. [-1,1] 6. What is the range of the function f(x)= cos ^-1 X? a. (- infinity, + infinity) b. -1 < x < 1 c. [-pi/2, pi/2] d. [0, pi]