Complete the identity.cos (x - 
) = ?
A. -cos x
B. -sin x
C. cos x
D. sin x
Answer: B
Mathematics
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Express the area of the region bounded by the given line(s) and/or curve(s) as an iterated double integral.The lines 
, 
, and 
A. 
B. 
C. 
D. 
Mathematics
Find the product. Write the product in rectangular form, using exact values.[7(cos 120° + i sin 120°)] [2(cos 90° + i sin 90°)]
A. 14 - 14
i
B. 7
- 28 i
C. -7
- 7 i
D. 5
- 
i
Mathematics
Graph the equation. Select integers for x, -3 ? x ? 3.y = 
x - 1
A. 
B. 
C. 
D. 
Mathematics
Multiply. Simplify the answer completely.30 ? 
? 
A. 18
B. 
C. 
D. 1
Mathematics