Solve the inequality. Express your answer in set notation.x2 ? 1
A. {x| -1 ? x ? 1}
B. {x| x ? -1 or x ? 1}
C. {x| -1 < x < 1}
D. {x| x ? 1}
Answer: A
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = sin-1(x2 + y2)
A. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at (0, 0)
B. Domain: all points in the xy-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 xy-plane; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
D. Domain: all points in the xy-plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
Evaluate or simplify the given expression.cos(2 cos-1 x)
A. 2x2 + 1 B. 2x2 - 1 C. 1 D. -1
Find the derivative.s = t3 - csc t + 4
A. 
= t2 - cot2t + 4
B. 
= 3t2 - csc t cot t
C. 
= 3t2 + cot2t
D. 
= 3t2 + csc t cot t
Provide an appropriate response.Monthly payments are the fastest way to pay off a home mortgage.
A. True B. False