Find the exact value of the expression.cot 
A. 
B. 
- 1
C. 2 - 
D. 2 + 
Answer: D
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Multiply the complex numbers and simplify powers of i.(6 + 3i)2
A. 27 - 36i B. 45 - 36i C. 27 + 36i D. 45 + 36i
Draw the given angle in standard position. Draw an arrow representing the correct amount of rotation. Find the measure of two other angles, one positive and one negative, coterminal with the given angle.295°
A. 755° and -105°
B. 85° and -95°
C. 655° and -65°
D. 65° and -65°
Solve the problem.Find the centroid of a hemispherical shell having outer radius 6 and inner radius 4 if the density varies as the square of the distance from the base.
A. 
= 0, 
= 0, 
= 
B. 
= 0, 
= 0, 
= 
C. 
= 0, 
= 0, 
= 
D. 
= 0, 
= 0, 
= 
Solve the equation. Use the change of base formula to approximate an exact answer to the nearest hundredth when appropriate.2x = 128
A. x = log2128 B. x = 64 C. x = log 128 D. x = log 64