Evaluate or simplify the given expression.sin(2 sin-1 x)

A. 2x
B. 2x - 2x3
C. 2x 
D. x

Answer: A

Mathematics

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A.
B.
C.
D.

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Use an identity to write the expression as a single trigonometric function or as a single number.

A. sin 7° B. cot 7° C. cos 7° D. tan 7°

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Solve the equation by completing the square.x2 + 62 = -18x

A. {9 + }
B. {-18 + }
C. {9 - , 9 + }
D. {-9 - , -9 + }

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Factor the perfect square.x4 - 14x2 + 49

A. (x2 - 7)2 B. (x2 + 7)2 C. (x - 7)2 D. (x - 7)(x + 7)

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