Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos ? = - 
, 
< ? < ?Find cos(2?).
A. 
B. 
C. - 
D. - 
Answer: D
Mathematics
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Find the derivative.y = ln(ex2 + 9)
A. 
B. 
C. 
D. 
Mathematics
Convert the measurement as indicated. Round to the nearest tenth, if necessary.31 cm to inches
A. 78.7 in. B. 12.1 in. C. 3.1 in. D. 9.3 in.
Mathematics
Set up a matrix equation with integer values that is equivalent to the system of equations.
What will be an ideal response?
Mathematics
Write the decimal as a fraction. Do not simplify.2.5
A. 
B. 
C. 
D. 
Mathematics