Rewrite the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the trigonometric expression without the use of a calculator.cos2 60° - sin2 60°
A. - 
B. - 
C. 
D. 
Answer: A
Mathematics
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Determine whether the nonincreasing sequence converges or diverges.an = 
A. Diverges B. Converges
Mathematics
Use the graph to determine the function's domain and range.
A. domain: [0, ?) range: [-2, ?) B. domain: [0, ?) range: (-?, ?) C. domain: [0, ?) range: [0, ?) D. domain: (-?, ?) range: [-2, ?)
Mathematics
Solve the equation.x3 - 8x2 - 9x = 0
A. {-9, 0, 1} B. {-1, 0, 9} C. {-9, -1, 0} D. {0, 1, 9}
Mathematics
Graph the equation using the slope and the y-intercept.2x - y = 0
A. 
B. 
C. 
D. 
Mathematics