Use De Morgan's laws to write the negation of the statement.6 < 12 or 7 ? 15
A. 6 < 12 or 7 = 15
B. 6 ? 12 or 7 ? 15
C. 6 ? 12 or 7 = 15
D. 6 ? 12 and 7 = 15
Answer: D
Mathematics
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A. 
B. 
C. 36
D. 11
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Use sum-to-product formulas to rewrite the expression as a product.cos 5x + cos 3x
A. 2 cos 4x sin x B. 2 cos 4x C. 2 cos 4x cos x D. 2 sin 4x sin x
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> - 
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Mathematics