Compute the division. Express your answer in simplest form.
÷ 
A. 
B. 
C. 
D. 
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = cos-1(x2 + y2)
A. Domain: all points in the x-y plane; range: all real numbers; level curves: circles with centers at (0, 0)
B. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0,0) and radii r, 0 < r ? 1
C. Domain: all points in the x-y plane; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
D. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
Find the exact value of the expression.cos 
cos 
- sin 
sin 
A. 0
B. 1
C. -1
D. 
Find the area of the rectangle or square.
A. 54 square feet B. 729 square feet C. 1458 square feet D. 108 square feet
Solve.Use the following graph to solve x2 - 2x - 8 = 0.y = x2 - 2x - 8
A. -2, 4 B. 4, 2 C. -4, -2 D. -4, 2