Complete the identity.sin 2x sin 5x cos 2x cos 5x = ?
A. cos2 20x
B. 
C. 
D. 
Answer: C
Mathematics
You might also like to view...
Find 35% of 70.
A. 50 B. 24.5 C. 35 D. 200
Mathematics
Solve the systems of equtions using the addition method. 
A. {(-1, -6)} B. {(-2, -5)} C. no solution; ? D. {(-1, -5)}
Mathematics
Use the square root property to solve the equation.-2x2 - 10 = -28
A. ±6 B. -14 C. ±3 D. 3
Mathematics
Solve the problem.In a certain city, the cost of a taxi ride is computed as follows: There is a fixed charge of $2.75 as soon as you get in the taxi, to which a charge of $1.75 per mile is added. Find a linear equation that can be used to determine the cost, y, of an x-mile taxi ride, and use this equation to find the cost of a 4-mile taxi ride.
A. $9.63 B. $9.75 C. $10.65 D. $9.93
Mathematics