Solve the equation by using sum-to-product identities in the interval [0, 2?).cos 2x - cos 4x = 0
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Find the derivative of the function.f(x) = log7 (x9 + 1)
A. 
B. 
C. 
+ 9x8
D. 
Mathematics
The function f is one-to-one. Find its inverse.f(x) = 
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 
D. f-1(x) = 
Mathematics
Solve the problem.Given the following revenue and cost functions, find the x-value that makes profit a maximum. (Recall that profit equals revenue minus cost.) R(x) = 58x - 2x2; C(x) = 25x + 98
A. 8.25 B. 9.25 C. 14.5 D. 16.5
Mathematics
Write the augmented matrix for the system. 4x + 2y = 4 8x + 8y = 0
A. 
B. 
C. 
D. 
Mathematics