Solve the problem.Suppose there are two low-frequency sound waves with similar frequencies. Let 
and 
model the two tones where t is time measured in seconds. Write the sum 
as a product of two trigonometric functions, and determine the frequency of the beats.
A. 3 beats per second
0.004 cos (93?t) cos (3?t)
B. 1.5 beats per second
0.004 cos (46.5?t) cos(1.5?t)
C. no beats
0.004 cos (46.5?t) cos (46.5?t)
D. no beats
0.004 cos (93?t) cos (93?t)
Answer: A
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Let A and B be sets with cardinal numbers, n(A) = a and n(B) = b, respectively. Decide whether the statement is true or false.If B ? A, n(B) = n(A - B).
A. True B. False
By calculating an appropriate number of terms, determine if the series converges or diverges. If it converges, find the limit L and the smallest integer N such that 
for 
otherwise indicate divergence.an = n tan 
A. diverges B. L = 0, N = 28 C. L = 1, N = 6 D. L = 1, N = 28
Find the product of the complex number and its conjugate.-7 + i
A. 56 B. 98 C. 42 D. 0
Approximate the number rounded to three decimal places, and truncated to three decimal places.3.4748
A. 3.474 3.475 B. 3.475 3.475 C. 3.475 3.474 D. 3.476 3.474