Calculate the area of the surface S. S is the portion of the cone 
+ 
= 
that lies between z = 2 and z = 6.
A. 72
?
B. 30
?
C. 30
D. 24
?
Answer: D
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Solve the problem.Find equations for the horizontal and vertical tangent lines to the curve 
A. Horizontal: y = 0 at (0, 0), y = 5 at 
; vertical: x = 
at 
, x = - 
at 
B. Horizontal: y = 
at 
, y = - 
at 
; vertical: x = 5 at (5, 0), x = 0 at 
C. Horizontal: y = 
at 
, y = - 
at 
; vertical: x = 0 at (0, 0), x = 5 at 
D. Horizontal: y = 5 at (5, 0), y = 0, 
; vertical: x = 
at 
, x = - 
at 
Use the half-angle formulas to simplify the given expression.
A. 4 sin 15x
B. 2 sin 15x
C. 
sin 15x
D. 2 cos 15x
Add or subtract, as indicated.(x2 - 7xy + 5y2) + (9x2 - 3xy - y2) + (-6x2 + xy - y2)
A. 4x2 - 9xy + 5y2 B. 4x2 - 9xy + 3y2 C. 3x2 - 9xy + 7y2 D. 4x2 - 17xy + 3y2
Determine if the pair of polar coordinates represents the same point.(9, 94°), (9, -266°)
A. Yes B. No