Find the exact value using a double-angle identity.tan(480°)
A. 
B. - 
C. - 
D. 0
Answer: C
Mathematics
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Using Green's Theorem, compute the counterclockwise circulation of F around the closed curve C.F = (-y - ey cos x)i + (y - ey sin x)j; C is the right lobe of the lemniscate r2 = cos 2? that lies in the first quadrant.
A. 1
B. 
C. 
D. 0
Mathematics
Solve the problem.Determine whether the ordered triple (2, 9, -4) is a solution of the system of equations.2x - 5y - 9z = -5 x + y + z = 73x - y + 5z = 35
A. Yes B. No
Mathematics
Determine if the parabola whose equation is given opens upward or downward.y = -x2 + 2x - 3
A. upward B. downward
Mathematics
Graph.9y2 - 36x2 = 324
A. 
B. 
C. 
D. 
Mathematics