Express the sum or difference as a product of sines and/or cosines.cos (6?) + cos (4?)
A. 2 sin (5?) sin ?
B. 2 cos (5?) cos ?
C. 2 cos (5?)
D. 2 cos (5?) sin ?
Answer: B
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Find zw or 
as specified. Leave your answer in polar form.z = 1 + iw = 
- iFind zw.
A. 2
(cos 345° + i sin 345°)
B. 2
(cos 15° + i sin 15°)
C. 2
(cos 75° + i sin 75°)
D. 
(cos 15° + i sin 15°)
Divide. Write the answer as a mixed number as needed.4
÷ 11
A. 
B. 
C. 
D. 
Solve the variation problem.If the voltage, V, in an electric circuit is held constant, the current, I, is inversely proportional to the resistance, R. If the current is 140 milliamperes when the resistance is 5 ohms, find the current when the resistance is 35 ohms.
A. 20 milliamperes B. 980 milliamperes C. 100 milliamperes D. 973 milliamperes
Solve the system of equations using substitution.
A. x = -8, y = -5 or (-8, -5) B. x = -8, y = 5 or (-8, 5) C. x = 8, y = -5 or (8, -5) D. x = 8, y = 5 or (8, 5)