Express the product as a sum or difference.cos 4x cos 8x
A. 
(cos 12x - sin 4x)
B. 
(cos 4x + cos 12x)
C. cos2 20x2
D. 
(cos 12x - cos 4x)
Answer: B
Mathematics
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Evaluate the determinant by expansion by minors.
A. -75 B. -12 C. -66 D. 540
Mathematics
Multiply.(x2 + 8y)(x2 - 8y)
A. x4 - 16x2y - 64y2 B. x4 + 16x2y - 64y2 C. x4 - 16y2 D. x4 - 64y2
Mathematics
Simplify the algebraic expression.4.2(-2.4x - 1.4)
A. -10.08x - 1.4 B. -10.08x - 5.88 C. 10.08x - 1.4 D. 10.08x - 5.88
Mathematics
Solve the problem using matrices.Anne and Nancy use a metal alloy that is 18.8% copper to make jewelry. How many ounces of an alloy that is 16% copper must be mixed with an alloy that is 20% copper to form 80 ounces of the desired alloy?
A. 56 oz B. 26 oz C. 61 oz D. 24 oz
Mathematics