Verify the identity.cos (x - y) - cos (x + y) = 2 sin x sin y
What will be an ideal response?
cos (x - y) - cos (x + y) = cos x cos y + sin x sin y - (cos x cos y - sin x sin y) = 2 sin x sin y.
Mathematics
You might also like to view...
Answer the question.Which one of the equations below matches the graph?
A. y = 3 sin
B. y = -3 sin
C. y = 3 cos
D. y = 3 cos
Mathematics
Solve the system by elimination.5 x - y = 114x + y = 16
A. (3, 4) B. (3, 5) C. (4, 3) D. No solution
Mathematics
Round the decimal to the indicated place value.94.0541, nearest thousandth
A. 94.054 B. 94.05 C. 94.053 D. 94.055
Mathematics
Provide an appropriate response.Write the equation of a line that passes through (-1, 4) and (5, -1). Write the final answer in the form 
where A, B, and C are integers with no common divisors (other than ±1) and 
A. -5x + 6y = 19 B. 5x + 6y = -19 C. 5x - 6y = 19 D. 5x + 6y = 19
Mathematics