Write the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression.cos2 60° - sin2 60°
A. - 
B. 
C. 
D. - 
Answer: A
Mathematics
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Four players (A, B, C, and D) agree to divide the 16 items shown below by lining them up in order and using the method of markers. The players' bids are as indicated.
Item 9
A. goes to A. B. goes to B. C. goes to C. D. goes to D. E. is left over.
Mathematics
Write the number in standard form.It takes approximately 1.578 × 10-5 miles to equal one inch.
A. 0.0001578 B. 0.000001578 C. 157,800 D. 0.00001578
Mathematics
Solve the system of equations by substitution, if a solution exists.
A. x = 1, y = 7 B. x = 0, y = 8 C. No solution D. x = -8, y = 0
Mathematics
Evaluate the function.Find f(3).
A. 27 B. 1 C. 0 D. 3
Mathematics