Use a double-angle identity to find the exact value of the expression.2 cos2 75° - 1

A. - 
B.
C. - 
D.

Answer: A

Mathematics

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Use the given transformation to evaluate the integral.     Rwhere R is the interior of the ellipsoid 

A. 28?
B. ?
C. 21?
D. 16?

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The graph of an exponential function is given. Match the graph to one of the following functions.

A. f(x) = 3-x B. f(x) = 3x C. f(x) = - 3x D. f(x) = - 3-x

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Perform the indicated operation. Write the result in the form a + bi.(8 - 7i)(2 + 5i)

A. 54 - 19i B. -19 - 54i C. 51 - 26i D. 51 + 26i

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Solve the problem.You have 212 feet of fencing to enclose a rectangular region. What is the maximum area?

A. 44,944 square feet B. 11,236 square feet C. 2809 square feet D. 2805 square feet

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Mathematics