Find the radius of convergence of the power series.

A. 4
B. ?
C. 2
D. 1

Answer: C

Mathematics

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Find the exact value of y, or state that y is undefined.y = sec-1 (-2)

A. - 
B.
C.
D. - 

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Mathematics

Solve the problem.For what numbers ? is f(?) = csc ? not defined?

A. integral multiples of ? (180°)
B. odd multiples of ? (180°)
C. all real numbers
D. odd multiples of  (90°)

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Mathematics

Write the number as the product of a real number and i.

A. 5i 
B. 5 
C. -5i 
D. -5 

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Mathematics

Perform the indicated operations and simplify the result. Leave the answer in factored form. + 

A.
B.
C.
D.

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Mathematics