Simplify the expression using the imaginary unit i.
A. 5i
B. -5
C. 5
D. -5i
Answer: A
Mathematics
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A. 2 B. No solution C. 1 D. -2
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Find the exact value of the expression.cos
A. 
B. 1
C. 
D. 
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Evaluate the expression when x = 5, y = -2, and t = 8.
A. - 10
B. - 13
C. 
D. undefined
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