Use sum-to-product identities to rewrite the expression as a product.cos 7? - cos 3?
A. -2 sin 5x sin 2x
B. -2 cos 5x sin 2x
C. 2 cos 2x
D. 2 cos 5x cos 2x
Answer: A
Mathematics
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Solve the problem.A gnomon to an isosceles triangle with angles 72°, 72°, 36° is
A. another triangle with angles 72°, 72°, 36°. B. an equilateral triangle. C. a golden rectangle. D. a triangle with angles 36°, 36°, 108°. E. none of these
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Find the product. Assume that all variable factors in the denominator are not equal to zero.
? 
A. 
B. 
C. 
D. 
Mathematics
Perform the indicated operation.909 ? 13
A. 11,817 B. 11,808 C. 11,826 D. 1287
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Solve the equation and express the solution in exact form.log4(log4 x) = 1
A. {256} B. {4} C. {8} D. {16}
Mathematics