Use sum-to-product formulas to rewrite the expression as a product.cos 9? - cos 3?
A. -2 sin 6x sin 3x
B. 2 cos 3x
C. 2 cos 6x cos 3x
D. -2 cos 6x sin 3x
Answer: A
Mathematics
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Determine whether the argument is valid or invalid.If I hear that poem, it reminds me of my mother. If I get sentimental, then it does not remind me of my mother. I get sentimental. Therefore, I don't hear that poem.
A. Invalid B. Valid
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Solve the problem.Determine the effective annual yield for $1 invested for 1 year at 2.5% compounded quarterly.
A. -7.48% B. 2.52% C. 12.52% D. 1.25%
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Factor completely.1 - 4x + 4x2
A. (1 + 2x)2 B. (1 - 2x)2 C. Prime D. (1 - 2x)(1 + 2x)
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Give the exact value of the expression.cos 
A. 
B. 
C. 
D. 
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