Use a double-angle identity to find the exact value of the expression.1 - 2 sin2  

A. - 
B. - 
C.
D. - 

Answer: D

Mathematics

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Simplify, where possible.5(x + 9)

A. x + 45 B. 5x + 45 C. 45x D. 5x + 9

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Factor, if possible.(s + 7)3 - 343

A. s(s2 - 21s + 147) B. s(s2 + 21s + 147) C. (s - 7)(s2 - 21s + 147) D. s(s + 7)(s - 49)

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Find all points where the function is discontinuous.

A. x = 4 B. x = 1, x = 5 C. None D. x = 1, x = 4, x = 5

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Solve. Check for extraneous solutions. +  = -1

A.
B. {1}
C. {0}
D. ?

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