Express the product as a sum containing only sines or cosines.cos(4?) cos(7?)
A. 
[cos(11?) - cos(3?)]
B. 
[cos(11?) - sin(3?)]
C. 
[cos(3?) + cos(11?)]
D. cos2(19?2)
Answer: C
Mathematics
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ABDF is a rhombus and BCEF is a rectangle in the figure. If ?DAF = 23° and AG = 14.35 m, find the measures of the numbered angles.
Mathematics
Find the domain of the indicated combined function.Find the domain of 
(x) when f(x) = 6x2 - 9x and g(x) = x2 - 8x - 8.
A. Domain: (-?,?)
B. Domain: 
? 
? 
C. Domain: 
? 
D. Domain: 
? 
? 
Mathematics
Simplify the expression.
- 
A. 65 B. 77 C. 13 D. 5
Mathematics
Use the formula for the sum of the first n terms of a geometric sequence to solve.Find the sum of the first 10 terms of the geometric sequence: 7, -14, 28, -56, 112, . . . .
A. -2380 B. -2387 C. -2393 D. -2389
Mathematics