Solve the given trigonometric equation analytically (using identities when necessary for exact values when possible) for values of x for 0 ? x < 2?.cos2 x + 2 cos x + 1 = 0
A. 
B. 
, 
C. ?
D. 
, 
Answer: C
Mathematics
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A. 53,945 B. 39,553 C. 40,553 D. 40,753
Mathematics
Solve the problem.Find the center of mass of the solid enclosed between the cone with equation 
and the plane with equation 
if the density at any point is proportional to the distance from that point to the axis of the cone.
A. (
, 
, 
) = 
B. (
, 
, 
) = 
C. (
, 
, 
) = 
D. (
, 
, 
) = 
Mathematics
Rewrite the trigonometric expression as an algebraic expression involving the variable u. Assume that 
and that the value of the "inner" inverse trigonometric expression represents an angle ? such that 
sec (sin-1 u)
A. 
B. 
C. 
D. 
Mathematics
Perform the indicated operation. Write the answer in scientific notation.(4.3 × 104)(2.2 × 105)
A. 9.46 × 109 B. 956 × 1018 C. 9.56 × 109 D. 946 × 107
Mathematics