Use a double-angle identity to find the exact value of the expression.2 cos2 75° - 1
A. 
B. - 
C. 
D. - 
Answer: D
Mathematics
You might also like to view...
Solve the problem.Calculate 
, where R ={(x, y): 0 ? x ? 1, 0 ? y ? 1}. (Hint: This integral represents the volume of a certain solid. Calculuate its volume from elementary principles.)
A. 7.5 B. 6.5 C. 7 D. 14
Mathematics
Solve the problem.A restaurant serves 8 ounces of soup to each customer. How many quarts of soup should be prepared in order to serve 59 customers?
A. 16
qt
B. 29
qt
C. 15
qt
D. 14
qt
Mathematics
Solve the application problem.A triangle is 5 centimeters wider than it is tall. The area is 102 square cm. Find the width (length of the base).
A. 5 cm B. 12 cm C. 18 cm D. 17 cm
Mathematics
Find fraction notation and simplify.0.8%
A. 
B. 
C. 
D. 
Mathematics