Complete the identity.cos (? + ?) cos (? - ?) = ?
A. 2 - sin2? - sin2?
B. cos2? - sin2?
C. cos2? - 2 sin2? sin2?
D. cos (?2) cos (?2) + sin (?2) sin (?2)
Answer: B
Mathematics
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Write an expression for the general or nth term, an, of the arithmetic sequence.-6, -1, 4, 9, . . .
A. an = 5n - 11 B. an = 5n - 6 C. an = 5(n+1) - 6 D. an = -5n - 11
Mathematics
Find the intersection of the given intervals.[-2, ?) ? (-?, 3]
A. [-2, 3] B. [-2, ?) C. (-?, 3] D. (-?, ?)
Mathematics
Solve for x using an equivalent exponential expression.Find the volume of a sphere with radius 4 inches. Use 
for 
A. 268
cu in.
B. 25
cu in.
C. 50
cu in.
D. 804
cu in.
Mathematics
Solve the equation. Use a calculator where appropriate. If the answer is irrational, round to the nearest hundredth.log (4x + 3) = 1
A. 
B. - 
C. 
D. - 
Mathematics