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

You might also like to view...

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