Find all cube roots of the complex number. Leave answers in trigonometric form.2 + 2i
A. 
cis 20°, 
cis 140°, 
cis 260°
B. 
cis 20°, 
cis 140°, 
cis 260°
C. 
cis 30°, 
cis 150°, 
cis 270°
D. 
cis 20°, 
cis 140°, 
cis 260°
Answer: D
Mathematics
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Solve the problem.Find the centroid of the infinite region in the first quadrant bounded by the coordinate axes and the curve 
.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Mathematics
Use the horizontal line test to determine whether the function is one-to-one.
A. No B. Yes
Mathematics
Find the exact value of the trigonometric expression without the use of a calculator.cos 75°
A. -
(
+ 1)
B. 
C. - 
D. -
(
- 1)
Mathematics
Use identities to write the expression as a single function of x or ?.cos (? + 90°)
A. cos ? B. -cos ? C. -sin ? D. sin ?
Mathematics