Use a double-angle identity to find the exact value of the expression.2 cos2 75° - 1
A. - 
B. 
C. - 
D. 
Answer: A
Mathematics
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Perform the indicated operation and simplify if possible.
A. 
B. 9
C. 3
D. 
Mathematics
Solve the linear equation.-8b + 7 + 6b = -3b + 12
A. -7 B. 5 C. 12 D. -12
Mathematics
Divide. Write the answer in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Find the average.76, 69, 89
A. 77 B. 79 C. 234 D. 78
Mathematics